经典equals ==例子

public class TestEquals {


     /**

      * @param args

      */

     public static void main(String[] args) {

         Integer a=new Integer(3);

         Long b =new Long(3l);

         Double c=new Double(3.0);

         System.out.println("false--->"+a.equals(b));

         System.out.println("false--->"+a.equals(c));

         System.out.println("false--->"+b.equals(c));

         System.out.println("true---->"+a.equals(3));

         System.out.println("true---->"+b.equals(3l));

         System.out.println("true---->"+c.equals(3.0));

         

         System.out.println("===========================");

         

         String aa =new String("aa");

         String bb =new String("aa");

         System.out.println("true---->"+aa.equals(bb));

         System.out.println("false--->"+aa==bb);

         

         System.out.println("===========================");

         Person p1 =new Person("ruby");

         Person p2 =new Person("ruby");

         System.out.println("false--->"+p1.equals(p2));

         System.out.println("false--->"+(p1==p2));

         

         System.out.println("===========================");

         Object o1 =new Object();

         Object o2 =new Object();

         System.out.println("false--->"+o1.equals(o2));

         System.out.println("false--->"+(o1==o2));

     }    
}
引号里面的true或者false表示结果
以上说明：String equals方法与普通类的equals不同，谨记。