package com.bage.study.java.string;

/**

* StringBuilder和StringBuffer

* @author bage

*

*/

public class BuilderBuffer {

public static void main(String[] args) {

String s = new String("dsds");

System.out.println(s.hashCode());

s = s + "dsdsd";

System.out.println(s.hashCode());

System.out.println("--------测试时间：-------------");

int n = 100000;

/**

* n = 100000;

* add:3567

addEquals:3225

appendSbd:4

appendSbf:5

*/

add(n);

addEquals(n);

appendSbd(n);

appendSbf(n);

}

private static String appendSbf(int n) {

long bf = System.currentTimeMillis();

StringBuffer str = new StringBuffer("a");

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

str.append("a");

}

System.out.println("appendSbf:" + (System.currentTimeMillis() - bf));

return str.toString();

}

private static String appendSbd(int n) {

long bf = System.currentTimeMillis();

StringBuilder str = new StringBuilder("a");

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

str.append("a");

}

System.out.println("appendSbd:" + (System.currentTimeMillis() - bf));

return str.toString();

}

private static String addEquals(int n) {

long bf = System.currentTimeMillis();

String str = "a";

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

str += "a";

}

System.out.println("addEquals:" + (System.currentTimeMillis() - bf));

return str;

}

private static String add(int n) {

long bf = System.currentTimeMillis();

String str = "a";

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

str = str + "a";

}

System.out.println("add:" + (System.currentTimeMillis() - bf));

return str;

}

}