中科软笔试题(解释原因)
String s1 = new String("abc");
String s2 = new String("abc");
System.out.println(s1 == s2);
String s3 = "abc";
String s4 = "abc";
System.out.println(s3 == s4);
s1 = s3; s2 = s4 ;
System.out.println(s1 == s2);
s3 = s1 ; s4 = s2;
System.out.println(s3 == s4);
在机器上面测试结果:
false
true
true
true
需要有人系统的解释原因,由于时间关系我也就懒得取找了,麻烦大家帮帮忙!呵呵!