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String vs StringBuilder vs StringBuffer in Java ?

Anonymous User 1030 21-Jul-2018

String vs StringBuilder vs StringBuffer in Java ?

java java 
Updated on 21-Jul-2018
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Prakash nidhi Verma

Prakash nidhi Verma

21-Jul-2018 
class mindstick
{ 
   // Concatenates to String

    public static void concat1(String s1)

    {

        s1 = s1 + "mindstick";

    }

    // Concatenates to StringBuilder

    public static void concat2(StringBuilder s2)

    {

        s2.append("mindstick");

    }

    // Concatenates to StringBuffer

    public static void concat3(StringBuffer s3)

    {

        s3.append("mindstick");

    }

    public static void main(String[] args)

    {

        String s1 = "mind";

        concat1(s1);  // s1 is not changed

        System.out.println("String: " + s1);

        StringBuilder s2 = new StringBuilder("mind");

        concat2(s2); // s2 is changed

        System.out.println("StringBuilder: " + s2);

        StringBuffer s3 = new StringBuffer("mind");

        concat3(s3); // s3 is changed

        System.out.println("StringBuffer: " + s3);

    }

}

From String to StringBuffer and StringBuilder : 

directly pass String class object to StringBuffer and StringBuilder in class constructors. 

public class Test  
{

    public static void main(String[] args)

    {

        String str = "mindstick";

        // conversion from String object to StringBuffer

        StringBuffer sbr = new StringBuffer(str);

        sbr.reverse();

        System.out.println(sbr);

        // conversion from String object to StringBuilder

        StringBuilder sbl = new StringBuilder(str);

        sbl.append("software");

        System.out.println(sbl);

    }

}
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