Java 实例 - 字符串优化
Java 教程
· 2019-02-10 09:13:27
以下实例演示了通过 String.intern() 方法来优化字符串：
StringOptimization.java 文件
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");
}
}
以上代码实例输出结果为：
直接使用字符串： 3 ms 使用 new 关键字：5 ms 使用字符串对象的 intern() 方法: 10 ms
点击查看所有 Java 教程 文章: https://codercto.com/courses/l/12.html
Music Recommendation and Discovery
Òscar Celma / Springer / 2010-9-7 / USD 49.95
With so much more music available these days, traditional ways of finding music have diminished. Today radio shows are often programmed by large corporations that create playlists drawn from a limited......一起来看看 《Music Recommendation and Discovery》 这本书的介绍吧!
