string stringbuffer stringbuilder
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改变String字符串的内容,增加或者删除的时候,String都会创建一个新的String对象,导致效率低下,所以引入了StringBuffer,在JDK1.5之后又引入了StringBuilder
StringBuffer 是线程安全的,但同时也比较耗时,因为线程安全,所以都要执行同步synchronized的操作
StringBuilder在单线程下运行速度最快,如果程序只是在单线程下运行,使用StringBuilder效率更高
public static void main(String[] args) throws Exception{int i = 0;long start = System.currentTimeMillis();StringBuilder sb = new StringBuilder();for(i = 0; i < 1000000; i++){sb.append(i);}long end1 = System.currentTimeMillis();System.out.println("StringBuilder cost :"+(end1-start)+"ms");StringBuffer sb2 = new StringBuffer();for(i = 0; i < 1000000; i++){sb2.append(i);}long end2 = System.currentTimeMillis();System.out.println("StringBuffer cost :"+(end2-end1)+"ms");String sb3 = new String();for(i = 0; i < 1000000; i++){sb3 += i;}long end3 = System.currentTimeMillis();System.out.println("String cost :"+(end3-end2)+"ms");}
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