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String str1 = "1" + "1";
String str2 = "11";
System.out.println(str1 == "11");//true
System.out.println(str1 == str2);//true
String s1 = "abb";
String s2 = "abb";
String s3 = "bb";
System.out.println(s1 == s2);// true
System.out.println(s1.substring(1));//bb
System.out.println(s3);//bb
System.out.println(s1.substring(1) == s3);//为运行时的字符串,false
String s4 = new String("1");
String s5 = new String("1");
System.out.println(s4 == s5);//false