如题:String s1 = "hello";
String s2 = "world";
String s3 = "helloworld";
System.out.println(s3 == s1 + s2);// false
System.out.println(s3.equals((s1 + s2)));// true
System.out.println(s3 == "hello" + "world");// false 这个我们错了,应该是true
System.out.println(s3.equals("hello" + "world"));// true |
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