局部内部类对外部属性和变量的访问测试

package test;
/**
*
* 局部内部类能不能访问外围方法或者属性的值 ？
*
* 局部内部类可以访问属性 ，但是不能访问非final的局部变量
*
*/
public class Test1 {
private String attribute ;
public void f(){
final String localAttribute = "" ;
class InnerClass {
public InnerClass(){
System.out.println("attribute " + attribute );
attribute = attribute + "" ;
//Cannot refer to
//the non-final local variable localAttribute
//defined in an enclosing scope
System.out.println("localAttribute " + localAttribute );
localAttribute = localAttribute + "" ;
}
}
}
}
/**
* 测试任意代码块中的内部类访问属性和局部变量
*/
class TestIfLocalClass {
private String attribute ;
public TestIfLocalClass(){
final String localAttribute = "" ;
if(true){
class IfLocalClass {
public IfLocalClass(){
System.out.println(attribute);
attribute = attribute + "" ;
System.out.println(localAttribute);
localAttribute = localAttribute + "" ;
}
}
}
}
}
/**
* 测试匿名内部类对外围属性和本地变量的访问
*/
interface TestAnonymousClass{
public void f() ;
}
class TestAClass{
private String attribute ;
public TestAnonymousClass f(){
final String localAttribute = "" ;
return new TestAnonymousClass(){
@Override
public void f() {
System.out.println(attribute);
attribute = attribute + "" ;
System.out.println(localAttribute);
localAttribute = localAttribute + "" ;
}
} ;
}
}