关于字符串,如何理解?

String s1="你好";

String s2="你" + new String("好");

String s3="你" + "好";

String n = "你";

String s4=n + "好";

System.out.println(s1==s2);    //false

System.out.println(s1==s3);    //true

System.out.println(s1==s4);   //false

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