为什么我会收到“找不到适合匿名的方法”错误？
Runnable r = new Runnable() {
@Override
public void run() {
if(varx) {
new displayFullScreen().setVisible(true);
} else {
javax.swing.JOptionPane.showMessageDialog(this, "dfv"); // this statement gives an error
}
}
};
new Thread(r,"full_screen_display").start();
标记行中的错误显示 “没有找到适合匿名的方法 (”
当我直接编写 时为什么会这样javax.swing._CLASS_ ？
Runnable r = new Runnable() {
@Override
public void run() {
if(varx) {
new displayFullScreen().setVisible(true);
} else {
javax.swing.JOptionPane.showMessageDialog(this, "dfv"); // this statement gives an error
}
}
};
new Thread(r,"full_screen_display").start();
The error in the marked line says "No suitable method found for anonymous (<java.lang.Runnable>,java.lang.String)"
Why does it so when i have directly written javax.swing._CLASS_ ?
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问题在于该行中的
this引用了您创建的匿名Runnable实例，而不是它周围的类。您需要更明确地说明其中的this的含义。如果封闭类名为
Foo，并且是一个 swingComponent，则应编写：请参阅 嵌套类 文档以获取更多信息。
The problem is that
thisin that line refers to the anonymousRunnableinstance you've created, not the class that surrounds it. You'll need to be more explicit about whatthisyou mean in there.If the enclosing class is named
Foo, and is a swingComponent, you should write:See the Nested Classes docs for more information.
原因是
javax.swing.JOptionPane.showMessageDialog需要一个Component作为第一个参数，但您传入的是this，它是一个可运行（匿名）。The reason is
javax.swing.JOptionPane.showMessageDialogexpects aComponentas the first argument, but you're passing inthis, which is aRunnable(anonymous).JOptionPane.showMessageDialog文档 说：javax.swing.JOptionPane.showMessageDialog(this, "dfv");将不起作用，因为this是一个Runnable，它不继承自组件。使用这个代替：
JOptionPane.showMessageDialogdocumentation says:javax.swing.JOptionPane.showMessageDialog(this, "dfv");will not work asthisis aRunnablewhich does not inherit fromComponent.Use this instead: