string-operations-test.java

package com.company;

public class Main {
    private  static int iterations = 100000;

    private static void testString() {
        String str = "";
        for (int i = 0; i < Main.iterations; i++) {
            str += "x";
        }
    }

    private static void testStringBuffer() {
        StringBuffer str = new StringBuffer(Main.iterations);
        for (int i = 0; i < Main.iterations; i++) {
            str.append("x");
        }
    }

    private static void testStringBuilder() {
        StringBuffer str = new StringBuffer(Main.iterations);
        for (int i = 0; i < Main.iterations; i++) {
            str.append("x");
        }
    }

    public static void main(String[] args) {
        long time = System.currentTimeMillis();
        testString();
        System.out.println("String operations took " + (System.currentTimeMillis() - time));
        time = System.currentTimeMillis();
        testStringBuilder();
        System.out.println("StringBuilder operations took " + (System.currentTimeMillis() - time));
        time = System.currentTimeMillis();
        testStringBuffer();
        System.out.println("StringBuffer operations took " + (System.currentTimeMillis() - time));
    }
}