我对 java 代码中的冒号有疑问,在下一段代码中,该行OuterClass:showMsg(text);
和该行OuterClass:InnerClass:showMsg(text);
没有给出错误,并且让我认为冒号字符的工作原理类似于 C++ 中的双冒号(范围解析),但运行后的输出让我离开有个问题,冒号是干什么用的?
public class OuterClass {
public void showMsg(String msg) {
System.out.format("OuterShow : %s%n", msg);
}
public static abstract class InnerClass {
public abstract void command();
public void showMsg(String msg) {
System.out.format("InnerShow : %s%n", msg);
}
}
public void someAction(){
new InnerClass() {
@Override
public void command() {
String text = "some text here";
this.showMsg(text);
OuterClass.this.showMsg(text);
InnerClass:showMsg(text);
OuterClass:showMsg(text);
OuterClass:InnerClass:showMsg(text);
}
}.command();
}
public static void main(String[] args) {
new OuterClass().someAction();
}
}
输出:
--- exec-maven ---
InnerShow : some text here
OuterShow : some text here
InnerShow : some text here
InnerShow : some text here
InnerShow : some text here
使用 jdk1.8.0_25 和 maven-3.2.3 在 windows 7 上测试