using of String constructor

You to take when you use the String class constructor.Like the following

Code:

String str1=new String("Hello");//Using the constructor

Constructor creates a new string means it does not intern the String. Interned String object reference can be obtained by using intern() method of the String class

this is different to the following

Code:

String str2="Hello";

If you want to compare the str1,str2 you can use str1.equals(str2) or use intern() function .

Code:

   
        String str1="Hello";
        String str2="Hello";
        String str3=new String("Hello");
        String str4=str3.intern();
        if(str1==str2)
            System.out.println("Equal1");
        if(str1==str4)
            System.out.println("Equal2");
        if(str3.equals(str1))
            System.out.println("Equal3");
        
        if(str3==str2)
        {
            System.out.println("Equal4");
        }else {
            System.out.println("Not Equal4");
        }
 

The output of this code is

Code:

Equal1
Equal2
Equal3
Not Equal4

_________________
M. S. Rakha, Ph.D.
Queen's University
Canada

Author: DrRakha
Mastermind

Posts: 2715
Have thanks: 74 time

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