解读JLS:https://docs.oracle.com/javase/specs/jls/se7/html/jls-15.html#jls-15.12.3
If the compile-time declaration is void
,then the method invocation must be a top level expression (that is,the Expression in an expression statement (§14.8) or in the ForInit or ForUpdate part of a for
statement (§14.14)),or a compile-time error occurs.
class T1 { public void a(){} public void b(){} public void test(int i){ for(a();i<0;i++,b()){ } } }
解读JLS:https://docs.oracle.com/javase/specs/jls/se7/html/jls-15.html#jls-15.12.4.2
When accessing an instance variable, super
means the same as a cast of this
(§15.11.2),but this equivalence does not hold true for method invocation. This is demonstrated by the example:
class T1 {
int a = 1;
}
class T2 extends T1 {
int a = 2;
}
class T3 extends T2 {
public void test() {
System.out.println(((T1) this).a);
System.out.println(((T2) this).a);
}
}
public class TestB {
public static void main(String[] args) {
T3 t3 = new T3();
t3.test();
}
}
打印的结果为1、2
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。