while(true)和for(;;)到底誰(shuí)快？
test code

public class TestLoop { 
    public void whileCode(){
       while (true){ } 
    } 
    public void forCode(){
        for (;;){ } 
    }
}

字節(jié)碼
執(zhí)行命令：javap -verbose .\TestLoop.class

  public void whileCode();
    descriptor: ()V
    flags: ACC_PUBLIC
    Code:
      stack=0, locals=1, args_size=1
         0: goto          0
      LineNumberTable:
        line 7: 0
      LocalVariableTable:
        Start  Length  Slot  Name   Signature
            0       3     0  this   LTestLoop;
      StackMapTable: number_of_entries = 1
        frame_type = 0 /* same */

  public void forCode();
    descriptor: ()V
    flags: ACC_PUBLIC
    Code:
      stack=0, locals=1, args_size=1
         0: goto          0
      LineNumberTable:
        line 14: 0
      LocalVariableTable:
        Start  Length  Slot  Name   Signature
            0       3     0  this   LTestLoop;
      StackMapTable: number_of_entries = 1
        frame_type = 0 /* same */

根據(jù)生成的字節(jié)碼在java中兩者沒(méi)有區(qū)別。分別在兩個(gè)循環(huán)中累加到1,000,000,000, 花費(fèi)時(shí)間分別為2毫秒代碼不粘貼出來(lái)了。結(jié)論不敢亂下，但是個(gè)人認(rèn)為兩者并沒(méi)區(qū)別。