java代码块注释_如何在Java中注释代码块

是否可以注释一段代码？例如.循环或简单的花括号？如果是这样,怎么样？

First.java

package An;

import An.ForCycle;

class First {

public static void main(String[] args) {

First f = new First();

}

public First () {

@ForCycle

{ // error: illegal start of type {

int k;

}

@ForCycle

for (int i = 0; i < 5; i++) { // similar error (illegal start...)

System.out.println(i);

}

}

}

ForCycle.java

package An;

import java.lang.annotation.Documented;

import java.lang.annotation.ElementType;

import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;

import java.lang.annotation.Target;

@Retention(RetentionPolicy.SOURCE)

public @interface ForCycle {}

@Target – indicates the kinds of program element to which an annotation type is applicable. Some possible values are TYPE, METHOD, CONSTRUCTOR, FIELD etc. If Target meta-annotation is not present, then annotation can be used on any program element.

任何程序元素(我猜)也意味着阻止,不是吗？那么为什么我不能注释阻止或为？我错过了什么？

感谢帮助