BAEL-1706 - optional parameters in java (#4050)
* BAEL-1706 - optional parameters in java * minor adjustments per review * add tests * fix formatting * fix constructor issue with MultiVitaminOverloading * BAEL-1706 Test name change, formatting
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chrisoberle
Predrag Maric
parent
80f8fee3c2
commit
57a4f160aa
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package com.baeldung.optionalparams;
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public class MultiVitamin {
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private String name; // required
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private int vitaminA; // in mcg
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private int vitaminC; // in mg
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private int calcium; // in mg
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private int iron; // in mg
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public MultiVitamin(String name) {
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this.name = name;
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}
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public String getName() {
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return name;
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}
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public int getVitaminA() {
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return vitaminA;
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}
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public void setVitaminA(int vitaminA) {
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this.vitaminA = vitaminA;
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}
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public int getVitaminC() {
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return vitaminC;
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}
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public void setVitaminC(int vitaminC) {
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this.vitaminC = vitaminC;
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}
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public int getCalcium() {
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return calcium;
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}
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public void setCalcium(int calcium) {
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this.calcium = calcium;
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}
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public int getIron() {
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return iron;
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}
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public void setIron(int iron) {
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this.iron = iron;
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}
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}
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package com.baeldung.optionalparams;
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public class MultiVitaminAllowingNulls {
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private String name; // required
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private Integer vitaminA; // in mcg
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private Integer vitaminC; // in mg
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private Integer calcium; // in mg
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private Integer iron; // in mg
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public MultiVitaminAllowingNulls(String name, Integer vitaminA, Integer vitaminC, Integer calcium, Integer iron) {
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this.name = name;
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this.vitaminA = vitaminA;
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this.vitaminC = vitaminC;
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this.calcium = calcium;
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this.iron = iron;
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}
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public String getName() {
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return name;
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}
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public Integer getVitaminA() {
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return vitaminA;
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}
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public Integer getVitaminC() {
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return vitaminC;
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}
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public Integer getCalcium() {
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return calcium;
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}
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public Integer getIron() {
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return iron;
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}
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}
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@ -0,0 +1,56 @@
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package com.baeldung.optionalparams;
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public class MultiVitaminOverloading {
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static final int DEFAULT_IRON_AMOUNT = 20;
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private final String name; // required
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private final int vitaminA; // in mcg
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private final int vitaminC; // in mg
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private final int calcium; // in mg
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private final int iron; // in mg
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public MultiVitaminOverloading(String name) {
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this(name, 0);
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}
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public MultiVitaminOverloading(String name, int vitaminA) {
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this(name, vitaminA, 0);
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}
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public MultiVitaminOverloading(String name, int vitaminA, int vitaminC) {
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this(name, vitaminA, vitaminC, 0);
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}
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public MultiVitaminOverloading(String name, int vitaminA, int vitaminC, int calcium) {
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this(name, vitaminA, vitaminC, calcium, DEFAULT_IRON_AMOUNT);
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}
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public MultiVitaminOverloading(String name, int vitaminA, int vitaminC, int calcium, int iron) {
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this.name = name;
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this.vitaminA = vitaminA;
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this.vitaminC = vitaminC;
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this.calcium = calcium;
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this.iron = iron;
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}
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public String getName() {
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return name;
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}
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public int getVitaminA() {
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return vitaminA;
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}
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public int getVitaminC() {
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return vitaminC;
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}
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public int getCalcium() {
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return calcium;
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}
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public int getIron() {
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return iron;
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}
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}
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package com.baeldung.optionalparams;
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public class MultiVitaminStaticFactoryMethods {
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static final int IRON_AMT_DEF = 20;
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static final int IRON_AMT_MEN = 30;
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static final int CALCIUM_AMT_DEF = 100;
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static final int CALCIUM_AMT_WOMEN = 120;
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private final String name; // required
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private final int vitaminA; // in mcg
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private final int vitaminC; // in mg
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private final int calcium; // in mg
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private final int iron; // in mg
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public static MultiVitaminStaticFactoryMethods forMen(String name) {
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return new MultiVitaminStaticFactoryMethods(name, 5000, 60, CALCIUM_AMT_DEF, IRON_AMT_MEN);
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}
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public static MultiVitaminStaticFactoryMethods forWomen(String name) {
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return new MultiVitaminStaticFactoryMethods(name, 5000, 60, CALCIUM_AMT_WOMEN, IRON_AMT_DEF);
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}
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private MultiVitaminStaticFactoryMethods(String name, int vitaminA, int vitaminC, int calcium, int iron) {
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this.name = name;
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this.vitaminA = vitaminA;
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this.vitaminC = vitaminC;
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this.calcium = calcium;
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this.iron = iron;
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}
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public String getName() {
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return name;
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}
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public int getVitaminA() {
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return vitaminA;
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}
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public int getVitaminC() {
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return vitaminC;
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}
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public int getCalcium() {
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return calcium;
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}
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public int getIron() {
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return iron;
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}
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}
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@ -0,0 +1,77 @@
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package com.baeldung.optionalparams;
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public class MultiVitaminWithBuilder {
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private final String name; // required
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private final int vitaminA; // in mcg
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private final int vitaminC; // in mg
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private final int calcium; // in mg
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private final int iron; // in mg
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private MultiVitaminWithBuilder(MultiVitaminBuilder builder) {
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this.name = builder.name;
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this.vitaminA = builder.vitaminA;
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this.vitaminC = builder.vitaminC;
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this.calcium = builder.calcium;
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this.iron = builder.iron;
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}
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public String getName() {
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return name;
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}
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public int getVitaminA() {
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return vitaminA;
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}
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public int getVitaminC() {
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return vitaminC;
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}
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public int getCalcium() {
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return calcium;
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}
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public int getIron() {
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return iron;
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}
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public static class MultiVitaminBuilder {
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private static final int ZERO = 0;
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private final String name; // required
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private int vitaminA = ZERO;
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private int vitaminC = ZERO;
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private int calcium = ZERO;
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private int iron = ZERO;
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public MultiVitaminBuilder(String name) {
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this.name = name;
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}
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public MultiVitaminBuilder withVitaminA(int vitaminA) {
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this.vitaminA = vitaminA;
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return this;
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}
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public MultiVitaminBuilder withVitaminC(int vitaminC) {
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this.vitaminC = vitaminC;
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return this;
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}
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public MultiVitaminBuilder withCalcium(int calcium) {
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this.calcium = calcium;
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return this;
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}
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public MultiVitaminBuilder withIron(int iron) {
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this.iron = iron;
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return this;
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}
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public MultiVitaminWithBuilder build() {
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return new MultiVitaminWithBuilder(this);
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}
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}
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}
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@ -0,0 +1,96 @@
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package com.baeldung.optionalparams;
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import static org.assertj.core.api.Assertions.assertThat;
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import java.math.BigDecimal;
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import org.assertj.core.util.Arrays;
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import org.junit.Test;
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public class OptionalParamsUnitTest {
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@Test
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public void whenCreateMultiVitaminWithOverloading_thenOk() {
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MultiVitaminOverloading multiVitamin = new MultiVitaminOverloading("Default Multivitamin");
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assertThat(multiVitamin.getName()).isEqualTo("Default Multivitamin");
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assertThat(multiVitamin.getVitaminA()).isEqualTo(0);
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assertThat(multiVitamin.getVitaminC()).isEqualTo(0);
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assertThat(multiVitamin.getCalcium()).isEqualTo(0);
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assertThat(multiVitamin.getIron()).isEqualTo(MultiVitaminOverloading.DEFAULT_IRON_AMOUNT);
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}
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@Test
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public void whenCreateMultiVitaminWithStaticFactoryMethods_thenOk() {
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MultiVitaminStaticFactoryMethods mensMultiVitamin = MultiVitaminStaticFactoryMethods.forMen("Complete for Men");
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assertThat(mensMultiVitamin.getName()).isEqualTo("Complete for Men");
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assertThat(mensMultiVitamin.getCalcium()).isEqualTo(MultiVitaminStaticFactoryMethods.CALCIUM_AMT_DEF);
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assertThat(mensMultiVitamin.getIron()).isEqualTo(MultiVitaminStaticFactoryMethods.IRON_AMT_MEN);
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MultiVitaminStaticFactoryMethods womensMultiVitamin = MultiVitaminStaticFactoryMethods.forWomen("Complete for Women");
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assertThat(womensMultiVitamin.getName()).isEqualTo("Complete for Women");
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assertThat(womensMultiVitamin.getCalcium()).isEqualTo(MultiVitaminStaticFactoryMethods.CALCIUM_AMT_WOMEN);
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assertThat(womensMultiVitamin.getIron()).isEqualTo(MultiVitaminStaticFactoryMethods.IRON_AMT_DEF);
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}
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@Test
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public void whenCreateMultiVitaminWithBuilder_thenOk() {
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MultiVitaminWithBuilder vitamin = new MultiVitaminWithBuilder.MultiVitaminBuilder("Maximum Strength")
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.withCalcium(100)
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.withIron(200)
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.withVitaminA(50)
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.withVitaminC(1000)
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.build();
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assertThat(vitamin.getName()).isEqualTo("Maximum Strength");
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assertThat(vitamin.getCalcium()).isEqualTo(100);
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assertThat(vitamin.getIron()).isEqualTo(200);
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assertThat(vitamin.getVitaminA()).isEqualTo(50);
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assertThat(vitamin.getVitaminC()).isEqualTo(1000);
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}
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@Test
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public void whenCreateMutliVitaminWithAccessors_thenOk() {
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MultiVitamin vitamin = new MultiVitamin("Generic");
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vitamin.setVitaminA(50);
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vitamin.setVitaminC(1000);
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vitamin.setCalcium(100);
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vitamin.setIron(200);
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assertThat(vitamin.getName()).isEqualTo("Generic");
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assertThat(vitamin.getCalcium()).isEqualTo(100);
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assertThat(vitamin.getIron()).isEqualTo(200);
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assertThat(vitamin.getVitaminA()).isEqualTo(50);
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assertThat(vitamin.getVitaminC()).isEqualTo(1000);
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}
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@Test
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public void whenCreateMultiVitaminWithNulls_thenOk() {
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MultiVitamin vitamin = new MultiVitamin(null);
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assertThat(vitamin.getName()).isNull();
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}
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public void varArgsDemo() {
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Object[] args = Arrays.array(Long.valueOf(1), Integer.valueOf(2), BigDecimal.valueOf(3));
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processVarArgsWithCastingAntiPattern(args);
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}
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private void processVarArgsWithCastingAntiPattern(Object... args) {
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String message = "processing %s as %s";
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// never do this sort of thing
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for (Object arg : args) {
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if (arg instanceof Long) {
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System.out.println(String.format(message, arg, "Long"));
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} else if (arg instanceof Integer) {
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System.out.println(String.format(message, arg, "Integer"));
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} else if (arg instanceof BigDecimal) {
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System.out.println(String.format(message, arg, "BigDecimal"));
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}
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}
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}
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}
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