/**以下实例演示了通过 String.intern() 方法来优化字符串

*/

public class StringOptimization {

public static void main(String[] args){

String variables[] = new String[50000];

for( int i=0;i <50000;i++){

variables[i] = "s"+i;

}

long startTime0 = System.currentTimeMillis();

for(int i=0;i<50000;i++){

variables[i] = "hello";

}

long endTime0 = System.currentTimeMillis();

System.out.println("直接使用字符串： "+ (endTime0 - startTime0) + " ms" );

long startTime1 = System.currentTimeMillis();

for(int i=0;i<50000;i++){

variables[i] = new String("hello");

}

long endTime1 = System.currentTimeMillis();

System.out.println("使用 new 关键字：" + (endTime1 - startTime1) + " ms");

long startTime2 = System.currentTimeMillis();

for(int i=0;i<50000;i++){

variables[i] = new String("hello");

variables[i] = variables[i].intern();

}

long endTime2 = System.currentTimeMillis();

System.out.println("使用字符串对象的 intern() 方法: "

+ (endTime2 - startTime2)

+ " ms");

}

}