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String str1 = "a";
String str2 = "b";
String str3 = "ab";
String str4 = str1 + str2;
String str5 = "a" + "b";
System.out.println("str3 == str4 " + (str3 == str4));
System.out.println("str3 == str5 " + (str3 == str5));
System.out.println("str4 == str5 " + (str4 == str5));
str3 == str4 false
str3 == str5 true
str4 == str5 false