public class StringTest {

    public static void main(String[] args) {

        long t = System.currentTimeMillis();
        StringTest();
        System.out.println("String : " +(System.currentTimeMillis() - t));

        t = System.currentTimeMillis();
        StringBuilderTest();
        System.out.println("StringBuilder: "+(System.currentTimeMillis() - t));

        t = System.currentTimeMillis();
        StringBufferTest();
        System.out.println("StringBuffer : "+(System.currentTimeMillis() - t));

    }


    public static void StringTest() {

        String s = "";
        for (int i = 0; i < 1000000; i++) {

            s += "*";

        }

    }

    public static void StringBuilderTest() {

        StringBuilder s = new StringBuilder();
        for (int i = 0; i < 1000000; i++) {

            s.append("*");

        }

    }

    public static void StringBufferTest() {

        StringBuffer s = new StringBuffer();

        for (int i = 0; i < 1000000; i++) {

            s.append("*");
        }

    }


}