private javax.swing.JTextField jt;
void a(){
System.out.println(reachMoneyTextField.getText() == "");
}
void b() {
System.out.println(reachMoneyTextField.getText() == null);
}
========很郁闷 两个都返回false========
不好意思 我自己想到了
void a(){
System.out.println("".equals(reachMoneyTextField.getText()));
}