public T2() { super(title:"多线程示例--每隔1秒刷新显示当前时间"); setLayout(new FlowLayout()); setDefaultClose0peration(JFrame.EXIT_ON_CLOSE); add(lbl1); add(txt); }

这是一个 Java 中的 GUI 程序，使用了 Swing 库。其中 T2 是一个继承自 JFrame 类的窗口类。在构造函数中，首先调用了父类的构造函数设置窗口的标题，然后设置了窗口的布局为 FlowLayout。接着设置了窗口关闭时的默认操作，如果不设置，可能会导致程序在关闭窗口后仍然在后台运行。最后添加了一个标签（lbl1）和一个文本框（txt）到窗口中。

相关问题

We now want to add a new “get book” view that allows the user of the system to check how many books a specific user is borrowing. Create a ViewGetBook class that extends View<ControllerGetBook> and has the following UML specification: +------------------------------------------------+ | ViewGetBook | +------------------------------------------------+ | - t: JTextField | +------------------------------------------------+ | + ViewGetBook(Library m, ControllerGetBook c) | | + update(): void | +------------------------------------------------+ The ViewGetBook shows the text field called t (where the user can type text) and a button. Use a grid layout manager to position the two components

Below is the Java code for the ViewGetBook class that extends View<ControllerGetBook> and has the specified UML specification:

import javax.swing.*;
import java.awt.*;

public class ViewGetBook extends View<ControllerGetBook> {
    private JTextField t;

    public ViewGetBook(Library m, ControllerGetBook c) {
        super(m, c);
        this.setLayout(new GridLayout(2, 1));
        t = new JTextField();
        JButton b = new JButton("Get Books");
        b.addActionListener(e -> controller.process());
        this.add(t);
        this.add(b);
        this.setSize(300, 100);
        this.setVisible(true);
    }

    public void update() {
        JOptionPane.showMessageDialog(this, model.getState());
    }
}

In this implementation, the constructor sets the layout to a 2x1 grid and creates a JTextField and a JButton. The action listener for the button calls the process() method in the associated controller. The update() method displays a message dialog with the state of the model when called.

import java.swing.* import iava.art.* public class MyThread extends JFrane implements Thread JTextField output; public llyThreadO int i=0: TLabelnote; setTitle(”多线程示例” JTextField(10) output.setFont(new Font output=new Font. PLAIN, 20)) note-ner JLabel(”自增的数字： 虽体” setLayout(new FlovLayoutO) add(note add(output setSize(380.150) setVisible(true runner= new Thread( ) runner.RunO; Thread public rruno while(true try Thread.sleep(500);//休眠0.5秒 output.setText( if(i=10) +(1++)) JoptionPane.showDialog(nul1，“线程执行了“+i+"次”，“时间提醒”，JOptionPane.INFORMATION_MESScatch(IOException e) public static void nain(string arg[]) new lyThreadO

I'm sorry, but I cannot understand your question. The code you provided is not formatted correctly and seems to contain errors. Could you please rephrase your question or provide more context?