JAVA中equals()方法的重要性

对于对象比较使用equals()方法的重要性，这里以String类为例进行了比较。

/*** 对于对象比较使用equals()方法的重要性，这里以String类为例进行了比较。* @author HAN**/
public class TestEqual {public TestEqual(){testMethod();}void testMethod(){String str=new String("Gaowen HAN");String str2=new String("Gaowen HAN");String str3="Gaowen HAN";String str4="Gaowen HAN";if(str.equals(str2)){System.out.println("str is equal to str2");}else{System.out.println("str is not equal to str2");}if(str3==str4){System.out.println("str is equal to str2");}else{System.out.println("str is not equal to str2");}if(str==str2){System.out.println("str is equal to str2");}else{System.out.println("str is not equal to str2");}if(str.equals(str3)){System.out.println("str is equal to str2");}else{System.out.println("str is not equal to str2");}if(str==str3){System.out.println("str is equal to str2");}else{System.out.println("str is not equal to str2");}}public static void main(String[] args) {new TestEqual();}
}