AppendStringTest.java

public class AppendStringTest{
public static void main(String[] args){
String text="";

long beginTime=System.currentTimeMillis();
for(int i=0;i<10000;i++)
text =text+i;

long endTime=System.currentTimeMillis();
System.out.println("执行时间: "+(endTime-beginTime));

StringBuilder builder=new StringBuider("");
beginTime=System.currentTimeMillis();
for(int i=0;i<10000;i++)
builder.append(String.valueOf(i));
endTime=System.currentTimeMillis();
System.out.println("执行时间: "+(endTime-beginTime));
}
}