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  • 异常处理

    //NumberFormatTest.java
    import java.awt.*;
    import java.awt.event.*;
    public class NumberFormatTest extends Frame implements ActionListener {
        private TextField tf;
        private Button btn;
        private List list;
        public static void main(String[] args) {
            NumberFormatTest test = new NumberFormatTest();
            test.setSize(300,200);
            test.setVisible(true);
        }
        public NumberFormatTest() {
            Panel panel = new Panel();
            tf = new TextField(5);
            btn = new Button("确定");
            btn.addActionListener(this);
            list = new List();
            panel.add(new Label("inter a number:"));
            panel.add(tf);
            add(panel,BorderLayout.NORTH);
            add(btn,BorderLayout.SOUTH);
            add(list,BorderLayout.CENTER);
        }
        public void actionPerformed(ActionEvent e) {
            int num;
            try {
                num = Integer.parseInt(tf.getText());
                list.removeAll();
                list.add(Integer.toString(num));
            } catch(NumberFormatException exc) {
                tf.setText("");
                }
        }
    }
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  • 原文地址:https://www.cnblogs.com/gride-glory/p/7668241.html
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