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public class StringTest { 
public static void main(String[] args) { 
String str1 = new String("abc"); 
String str2 = "abc"; 
if (str1 == str2) { 
            System.out.println("str1 == str2"); 
        } else { 
            System.out.println("str1 != str2"); 
        } 
String str3 = "abc"; 
if (str2 == str3) { 
            System.out.println("str2 == str3"); 
        } else { 
            System.out.println("str2 != str3"); 
        } 
        str1 = str1.intern(); 
if (str1 == str2) { 
            System.out.println("str1 == str2"); 
        } else { 
            System.out.println("str1 != str2"); 
        } 
String str4 = new String("abc"); 
        str4 = str4.intern(); 
if (str1 == str4) { 
            System.out.println("str1 == str4"); 
        } else { 
            System.out.println("str1 != str4"); 
        } 
    } 

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str1 != str2 
str2 == str3 
str1 == str2 
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