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String s1 = null; String s2 = null; System.out.println(s1==s2);//true //System.out.println(s1.equals(s2));//NullPointerException s1 = s2; System.out.println(s1==s2);//true //System.out.println(s1.equals(s2));//NullPointerException System.out.println("***1***"); s1 = null; s2 = ""; System.out.println(s1==s2);//false //System.out.println(s1.equals(s2));//NullPointerException s1 = s2; System.out.println(s1==s2);//true System.out.println(s1.equals(s2));//true System.out.println("***2***"); s1 = ""; s2 = null; System.out.println(s1==s2);//false System.out.println(s1.equals(s2));//false s1 = s2; System.out.println(s1==s2);//true //System.out.println(s1.equals(s2));//NullPointerException System.out.println("***3***"); s1 = ""; s2 = ""; System.out.println(s1==s2);//true System.out.println(s1.equals(s2));//true s1 = s2; System.out.println(s1==s2);//true System.out.println(s1.equals(s2));//true System.out.println("***4***"); s1 = new String(""); s2 = new String(""); System.out.println(s1==s2);//false System.out.println(s1.equals(s2));//true s1 = s2; System.out.println(s1==s2);//true System.out.println(s1.equals(s2));//true System.out.println("***5***"); s1 = "null"; s2 = "null"; System.out.println(s1==s2);//ture System.out.println(s1.equals(s2));//true s1 = s2; System.out.println(s1==s2);//true System.out.println(s1.equals(s2));//true System.out.println("***6***"); s1 = new String("null"); s2 = new String("null"); System.out.println(s1==s2);//flase System.out.println(s1.equals(s2));//true s1 = s2; System.out.println(s1==s2);//true System.out.println(s1.equals(s2));//true System.out.println("***7***"); s1 = "abc"; s2 = "abc"; System.out.println(s1==s2);//ture System.out.println(s1.equals(s2));//true s1 = s2; System.out.println(s1==s2);//true System.out.println(s1.equals(s2));//true System.out.println("***8***"); s1 = new String("abc"); s2 = new String("abc"); System.out.println(s1==s2);//false System.out.println(s1.equals(s2));//true s1 = s2; System.out.println(s1==s2);//true System.out.println(s1.equals(s2));//true System.out.println("***9***"); 返回类别: 教程 上一教程: JSP入门初级教程之JSP指令 下一教程: J2EE应用部署(二)：实践篇 您可以阅读与"JAVA中两个字符串“EQUALS”和“==”的区别"相关的教程: · java中两个字符串“Equals”和“==”的区别 · Java中得到一个字符串中每个字符的Unicode值 · java中按字节截取String字符串. · 各种数字类型转变成字符串型--JAVA · js中判定由字符串from和to代表的两个日期的先后关系 |
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