jTextField1.addFocusListener(this);
......
public void focusLost(FocusEvent e){
System.out.println("lost");
try{
Integer.parseInt(jTextField1.getText().trim());
}catch(Exception ex){
jTextField1.requestFocus();
}
}
public void focusGained(FocusEvent e){}
......
public void focusLost(FocusEvent e){
System.out.println("lost");
try{
Integer.parseInt(jTextField1.getText().trim());
}catch(Exception ex){
jTextField1.requestFocus();
}
}
public void focusGained(FocusEvent e){}
解决方案 »
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