https://www.ossez.com/t/java-tostring/14000 Java 对象如何安全的 toString

core-java-modules/core-java-strings/pom.xml

@@ -0,0 +1,55 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>core-java-strings</artifactId>
+    <name>core-java-strings</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.ossez</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>0.0.2-SNAPSHOT</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-core</artifactId>
+            <version>${jmh-core.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-generator-annprocess</artifactId>
+            <version>${jmh-generator.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.ibm.icu</groupId>
+            <artifactId>icu4j</artifactId>
+            <version>${icu4j.version}</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>core-java-strings</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+    </build>
+
+    <properties>
+        <icu4j.version>61.1</icu4j.version>
+        <maven.compiler.release>15</maven.compiler.release>
+    </properties>
+
+</project>

core-java-modules/core-java-strings/src/main/java/com/ossez/java9/compactstring/CompactStringDemo.java

@@ -1,4 +1,4 @@
-package com.baeldung.java9.compactstring;
+package com.ossez.java9.compactstring;
 
 import java.util.List;
 import java.util.stream.IntStream;

core-java-modules/core-java-strings/src/main/java/com/ossez/localization/App.java

@@ -1,4 +1,4 @@
-package com.baeldung.localization;
+package com.ossez.localization;
 
 import java.text.ParseException;
 import java.util.Arrays;

core-java-modules/core-java-strings/src/main/java/com/ossez/localization/ICUFormat.java

@@ -1,4 +1,4 @@
-package com.baeldung.localization;
+package com.ossez.localization;
 
 import com.ibm.icu.text.MessageFormat;
 

core-java-modules/core-java-strings/src/main/java/com/ossez/localization/JavaSEFormat.java

@@ -1,4 +1,4 @@
-package com.baeldung.localization;
+package com.ossez.localization;
 
 import java.text.MessageFormat;
 import java.util.Date;

core-java-modules/core-java-strings/src/main/java/com/ossez/localization/Localization.java

@@ -1,4 +1,4 @@
-package com.baeldung.localization;
+package com.ossez.localization;
 
 import java.util.List;
 import java.util.Locale;

core-java-modules/core-java-strings/src/main/java/com/ossez/multiline/MultiLineString.java

@@ -1,7 +1,8 @@
-package com.baeldung.multiline;
+package com.ossez.multiline;
 
 import com.google.common.base.Joiner;
 import com.google.common.collect.ImmutableList;
+import org.apache.commons.lang3.StringUtils;
 
 import java.io.IOException;
 import java.io.PrintWriter;
@@ -65,10 +66,11 @@ public class MultiLineString {
     }
 
     public String textBlocks() {
-        return """
-            Get busy living
-            or
-            get busy dying.
-            --Stephen King""";
+//        return """
+//            Get busy living
+//            or
+//            get busy dying.
+//            --Stephen King""";
+        return StringUtils.EMPTY;
     }
 }

core-java-modules/core-java-strings/src/main/java/com/ossez/stringperformance/StringPerformance.java

@@ -1,4 +1,4 @@
-package com.baeldung.stringperformance;
+package com.ossez.stringperformance;
 
 import com.google.common.base.Splitter;
 import org.apache.commons.lang3.StringUtils;

core-java-modules/core-java-strings/src/test/java/com/ossez/chararraypassword/PasswordStoreExamplesUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.chararraypassword;
+package com.ossez.chararraypassword;
 
 import org.junit.Test;
 

core-java-modules/core-java-strings/src/test/java/com/ossez/interview/LocaleUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.interview;
+package com.ossez.interview;
 
 import org.junit.Test;
 

core-java-modules/core-java-strings/src/test/java/com/ossez/interview/StringAnagramUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.interview;
+package com.ossez.interview;
 
 import org.junit.Test;
 

core-java-modules/core-java-strings/src/test/java/com/ossez/interview/StringChangeCaseUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.interview;
+package com.ossez.interview;
 
 import org.junit.Test;
 

core-java-modules/core-java-strings/src/test/java/com/ossez/interview/StringCountOccurrencesUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.interview;
+package com.ossez.interview;
 
 import org.junit.Test;
 

core-java-modules/core-java-strings/src/test/java/com/ossez/interview/StringFormatUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.interview;
+package com.ossez.interview;
 
 import org.junit.Test;
 

core-java-modules/core-java-strings/src/test/java/com/ossez/interview/StringInternUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.interview;
+package com.ossez.interview;
 
 import org.junit.Test;
 

core-java-modules/core-java-strings/src/test/java/com/ossez/interview/StringJoinerUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.interview;
+package com.ossez.interview;
 
 import org.junit.Test;
 

core-java-modules/core-java-strings/src/test/java/com/ossez/interview/StringNullCheckUnitTest.java

@@ -0,0 +1,27 @@
+package com.ossez.interview;
+
+import org.apache.commons.lang3.ObjectUtils;
+import org.apache.commons.lang3.StringUtils;
+import org.junit.Test;
+
+import java.util.Objects;
+
+import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
+import static org.assertj.core.api.AssertionsForClassTypes.assertThatExceptionOfType;
+
+public class StringNullCheckUnitTest {
+    @Test
+    public void toString_null_safe() {
+        Object obj = null;
+
+        ObjectUtils.toString(obj, StringUtils.EMPTY);
+        ObjectUtils.toString(obj, ()->StringUtils.EMPTY);
+        assertThat("null").isEqualTo(Objects.toString(obj));
+        assertThat("").isEqualTo(Objects.toString(obj,StringUtils.EMPTY));
+
+        assertThatExceptionOfType(NullPointerException.class).isThrownBy(() ->{
+            obj.toString();
+        });
+
+    }
+}

core-java-modules/core-java-strings/src/test/java/com/ossez/interview/StringPalindromeUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.interview;
+package com.ossez.interview;
 
 import org.junit.Test;
 

core-java-modules/core-java-strings/src/test/java/com/ossez/interview/StringReverseUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.interview;
+package com.ossez.interview;
 
 import org.junit.Test;
 

core-java-modules/core-java-strings/src/test/java/com/ossez/interview/StringSplitUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.interview;
+package com.ossez.interview;
 
 import org.apache.commons.lang3.StringUtils;
 import org.junit.Test;

core-java-modules/core-java-strings/src/test/java/com/ossez/interview/StringToByteArrayUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.interview;
+package com.ossez.interview;
 
 import org.junit.Test;
 

core-java-modules/core-java-strings/src/test/java/com/ossez/interview/StringToCharArrayUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.interview;
+package com.ossez.interview;
 
 import org.junit.Test;
 

core-java-modules/core-java-strings/src/test/java/com/ossez/interview/StringToIntegerUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.interview;
+package com.ossez.interview;
 
 import org.junit.Test;
 

core-java-modules/core-java-strings/src/test/java/com/ossez/localization/ICUFormatUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.localization;
+package com.ossez.localization;
 
 import org.junit.Test;
 

core-java-modules/core-java-strings/src/test/java/com/ossez/multiline/MultiLineStringUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.multiline;
+package com.ossez.multiline;
 
 import org.junit.Test;
 

core-java-modules/core-java-strings/src/test/java/com/ossez/randomstrings/RandomStringsUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.randomstrings;
+package com.ossez.randomstrings;
 
 import org.apache.commons.lang3.RandomStringUtils;
 import org.junit.Test;

core-java-modules/core-java-strings/src/test/java/com/ossez/stringnotempty/StringNotEmptyUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.stringnotempty;
+package com.ossez.stringnotempty;
 
 import com.google.common.base.Strings;
 import org.apache.commons.lang3.StringUtils;

core-java-modules/core-java-strings/src/test/java/com/ossez/stringpool/StringPoolUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.stringpool;
+package com.ossez.stringpool;
 
 import static org.assertj.core.api.Assertions.assertThat;
 

core-java-modules/core-java-strings/src/test/java/com/ossez/stringtoolong/StringTooLongUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.stringtoolong;
+package com.ossez.stringtoolong;
 
 import static org.assertj.core.api.Assertions.assertThat;