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Merge pull request #3688 from harshjain25/BAEL-1526-string-comparison 

BAEL-1526 : Comparing strings in Java
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Loredana Crusoveanu 2018-02-18 13:50:41 +02:00 committed by GitHub
parent 1b0e859d3a 5aa81d9be3
commit 544cd5253c
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core-java/src/test/java/com/baeldung/string/StringComparisonTest.java Normal file
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package com.baeldung.string;
import org.apache.commons.lang3.StringUtils;
import org.junit.Test;
import java.util.Objects;
import static org.assertj.core.api.Assertions.assertThat;
public class StringComparisonTest {
@Test
public void whenUsingComparisonOperator_ThenComparingStrings(){
String string1 = "using comparison operator";
String string2 = "using comparison operator";
String string3 = new String("using comparison operator");
assertThat(string1 == string2).isTrue();
assertThat(string1 == string3).isFalse();
}
@Test
public void whenUsingEqualsMethod_ThenComparingStrings(){
String string1 = "using equals method";
String string2 = "using equals method";
String string3 = "using EQUALS method";
String string4 = new String("using equals method");
assertThat(string1.equals(string2)).isTrue();
assertThat(string1.equals(string4)).isTrue();
assertThat(string1.equals(null)).isFalse();
assertThat(string1.equals(string3)).isFalse();
}
@Test
public void whenUsingEqualsIgnoreCase_ThenComparingStrings(){
String string1 = "using equals ignore case";
String string2 = "USING EQUALS IGNORE CASE";
assertThat(string1.equalsIgnoreCase(string2)).isTrue();
}
@Test
public void whenUsingCompareTo_ThenComparingStrings(){
String Author = "author";
String Book = "book";
String duplicateBook = "book";
assertThat(Author.compareTo(Book)).isEqualTo(-1);
assertThat(Book.compareTo(Author)).isEqualTo(1);
assertThat(duplicateBook.compareTo(Book)).isEqualTo(0);
}
@Test
public void whenUsingCompareToIgnoreCase_ThenComparingStrings(){
String Author = "Author";
String Book = "book";
String duplicateBook = "BOOK";
assertThat(Author.compareToIgnoreCase(Book)).isEqualTo(-1);
assertThat(Book.compareToIgnoreCase(Author)).isEqualTo(1);
assertThat(duplicateBook.compareToIgnoreCase(Book)).isEqualTo(0);
}
@Test
public void whenUsingObjectsEqualsMethod_ThenComparingStrings(){
String string1 = "using objects equals";
String string2 = "using objects equals";
String string3 = new String("using objects equals");
assertThat(Objects.equals(string1, string2)).isTrue();
assertThat(Objects.equals(string1, string3)).isTrue();
assertThat(Objects.equals(null, null)).isTrue();
assertThat(Objects.equals(null, string1)).isFalse();
}
@Test
public void whenUsingEqualsOfApacheCommons_ThenComparingStrings(){
assertThat(StringUtils.equals(null, null)).isTrue();
assertThat(StringUtils.equals(null, "equals method")).isFalse();
assertThat(StringUtils.equals("equals method", "equals method")).isTrue();
assertThat(StringUtils.equals("equals method", "EQUALS METHOD")).isFalse();
}
@Test
public void whenUsingEqualsIgnoreCaseOfApacheCommons_ThenComparingStrings(){
assertThat(StringUtils.equalsIgnoreCase(null, null)).isTrue();
assertThat(StringUtils.equalsIgnoreCase(null, "equals method")).isFalse();
assertThat(StringUtils.equalsIgnoreCase("equals method", "equals method")).isTrue();
assertThat(StringUtils.equalsIgnoreCase("equals method", "EQUALS METHOD")).isTrue();
}
@Test
public void whenUsingEqualsAnyOf_ThenComparingStrings(){
assertThat(StringUtils.equalsAny(null, null, null)).isTrue();
assertThat(StringUtils.equalsAny("equals any", "equals any", "any")).isTrue();
assertThat(StringUtils.equalsAny("equals any", null, "equals any")).isTrue();
assertThat(StringUtils.equalsAny(null, "equals", "any")).isFalse();
assertThat(StringUtils.equalsAny("equals any", "EQUALS ANY", "ANY")).isFalse();
}
@Test
public void whenUsingEqualsAnyIgnoreCase_ThenComparingStrings(){
assertThat(StringUtils.equalsAnyIgnoreCase(null, null, null)).isTrue();
assertThat(StringUtils.equalsAnyIgnoreCase("equals any", "equals any", "any")).isTrue();
assertThat(StringUtils.equalsAnyIgnoreCase("equals any", null, "equals any")).isTrue();
assertThat(StringUtils.equalsAnyIgnoreCase(null, "equals", "any")).isFalse();
assertThat(StringUtils.equalsAnyIgnoreCase(
"equals any ignore case", "EQUALS ANY IGNORE CASE", "any")).isTrue();
}
@Test
public void whenUsingCompare_thenComparingStringsWithNulls(){
assertThat(StringUtils.compare(null, null)).isEqualTo(0);
assertThat(StringUtils.compare(null, "abc")).isEqualTo(-1);
assertThat(StringUtils.compare("abc", "bbc")).isEqualTo(-1);
assertThat(StringUtils.compare("bbc", "abc")).isEqualTo(1);
assertThat(StringUtils.compare("abc", "abc")).isEqualTo(0);
}
@Test
public void whenUsingCompareIgnoreCase_ThenComparingStringsWithNulls(){
assertThat(StringUtils.compareIgnoreCase(null, null)).isEqualTo(0);
assertThat(StringUtils.compareIgnoreCase(null, "abc")).isEqualTo(-1);
assertThat(StringUtils.compareIgnoreCase("Abc", "bbc")).isEqualTo(-1);
assertThat(StringUtils.compareIgnoreCase("bbc", "ABC")).isEqualTo(1);
assertThat(StringUtils.compareIgnoreCase("abc", "ABC")).isEqualTo(0);
}
@Test
public void whenUsingCompareWithNullIsLessOption_ThenComparingStrings(){
assertThat(StringUtils.compare(null, "abc", true)).isEqualTo(-1);
assertThat(StringUtils.compare(null, "abc", false)).isEqualTo(1);
}
}