StringTable 练习
String s1 = "a";
String s2 = "b";
String s3 = "ab";
String s4 = "a" + "b";
String s5 = s1 + s2;
String s6 = s5.intern();
String s7 = new String("ab");
String s8 = s1 + "b";
System.out.println(s3 == s4);
System.out.println(s3 == s5);
System.out.println(s3 == s6);
System.out.println(s3 == s7);
System.out.println(s3 == s8);
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