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### JFrame不具備模態窗口的條件
```
Window類的構造：
Window(GraphicsConfiguration gc){} //Frame和JFrame采用了這個構造方法
//下面這三個構造方法才能拓展出模態窗口，因為它們指定了一個Frame或Window作為其所有者
Window(Frame owner){}
Window(Window owner){}
Window(Window owner, GraphicsConfiguration gc){}



Dialog繼承的是Window類，它的構造如下：
public Dialog(Frame owner, String title, boolean modal, GraphicsConfiguration gc) {
    super(owner, gc); //重點在這里，所以它可以設置模態 
    this.title = title;
    this.modal = modal;
    setFocusTraversalPolicy(KeyboardFocusManager.getCurrentKeyboardFocusManager().getDefaultFocusTraversalPolicy());
}

JFrame和它的父類Frame的構造：
public Frame(String title, GraphicsConfiguration gc) {
    super(gc); //采用了Window的第一種構造
    init(title, gc);
}
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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