Java 内部类-6ren

Java 内部类

转载作者：搜寻专家更新时间：2023-10-31 20:23:13

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Possible Duplicates:
Cannot refer to a non-final variable inside an inner class defined in a different method
Why inner classes require “final” outer instance variables [Java] ?

class MyOuter {    

    private String x = "Outer";
    void doStuff(){
           final String z = "local variable";
           class MyInner {
                 public void seeOuter(){
                        System.out.println("Outer x is" + x);
                        System.out.println("Local variable z is" + z); // does
                        // not compile if final keyword from String z is removed
                 }
           }
     }
}

上面的代码工作正常。我想知道为什么如果我从 String z 中删除 final 关键字，编译器会报错。 final 关键字有什么区别？