Integer a = new Integer(123);
Integer b = new Integer(123);
System.out.println(a == b);
System.out.println(a.equals(b));
System.out.println(a.equals(123));
System.out.println(a == 123);
输出
false
true
true
true
String a = new String("nihao");
String b = new String("nihao");
System.out.println(a==b);
System.out.println(a.equals(b));
System.out.println(a=="nihao");
System.out.println(a.equals("nihao"));
输出
false
true
false
true
java integer String之equals vs ==
原文：http://www.cnblogs.com/SEC-fsq/p/5658288.html