我可以在方法体中使用注释吗? [英] Can I use an annotation inside a method body?

问题描述

允许 Java 注释的语义将它们放在函数体内的某个位置，例如注释特定的函数调用、语句或表达式?

Allows the semantics of Java annotations to place them somewhere inside a functions body, e.g. to annotate a specific function call, statement or expression?

例如:

class MyClass {
    void theFunc(Thing thing) {
        String s = null;
        @Catching(NullPointerException)   //<< annotation ?
          s = thing.getProp().getSub().getElem().getItem();
        if(s==null)
            System.out.println("null, you fool");
    }
}

缩写经常写的(太频繁了，绝对！):

To abbreviate the often written (too often, definitly!):

class MyClass {
    void theFunc(Thing thing) {
        String s = null;
        try {
            s = thing.getProp().getSub().getElem().getItem();
        } catch(NullPointerException ex) { }
        if(s==null) 
            System.out.println("null, you fool");            
    }
}

这个嵌入式注释的概念是否可行?或者类似的东西?

If the concept of this embedded annotation possible at all? Or something similar?

推荐答案

ElementType 指定注释的有效目标.您不能注释任何旧语句.它基本上缩小到声明；声明:

ElementType specifies the valid targets of an annotation. You can't annotate any old statement. It's basically narrowed down to declarations; declarations of:

• 注释类型
• 构造函数
• 字段
• 局部变量
• 方法
• 包装
• 参数
• 输入

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