南京邮电大学java第四次实验报告

实 验 报 告

（ 2017 / 2018学年 第2学期）

三、实验内容

1. 编写一个Applet，利用两个文本框对象input1和input2，接收用户从键盘输入的两个整型数。当用户单击“计算”按钮时，可进行算术计算，并输出运算结果；运算结果放在多行文本域JTextArea组件中。GUI界面参考教材198页9.6题。

package swing;

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

/**
 * @Author liguo
 * @Description
 * @Data 2018-06-04 20:06
 */
public class Test {
    public static void main(String[] args) {
        // 创建 JFrame 实例
        JFrame frame = new JFrame( "四则运算" );
        frame.setSize( 350, 300 );
        frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

        /* 创建面板，这个类似于 HTML 的 div 标签
         * 我们可以创建多个面板并在 JFrame 中指定位置
         * 面板中我们可以添加文本字段，按钮及其他组件。
         */
        JPanel panel = new JPanel();
        //添加面板
        frame.add( panel );
        /*
         * 调用用户定义的方法并添加组件到面板
         */
        placeComponents( panel );

        // 设置界面可见
        frame.setVisible( true );
    }

    private static void placeComponents(JPanel panel) {

        panel.setLayout( null );

        // 创建 JLabel
        JLabel firstLabel = new JLabel( "第一个数为" );
        /* 这个方法定义了组件的位置。
         * setBounds(x, y, width, height)
         * x 和 y 指定左上角的新位置，由 width 和 height 指定新的大小。
         */
        firstLabel.setBounds( 10, 20, 80, 25 );
        panel.add( firstLabel );

        //field
        JTextField firstNumber = new JTextField( 20 );
        firstNumber.setBounds( 100, 20, 165, 25 );
        panel.add( firstNumber );

        // 输入的文本域
        JLabel secondlabe2 = new JLabel( "第二个数字" );
        secondlabe2.setBounds( 10, 50, 80, 25 );
        panel.add( secondlabe2 );

        /**
         * 第二个数字的输入
         */

        JTextField secondNumber = new JTextField( 20 );
        secondNumber.setBounds( 100, 50, 165, 25 );
        panel.add( secondNumber );

        // 创建计算按钮
        JButton loginButton = new JButton( "计算" );
        loginButton.setBounds( 10, 80, 80, 25 );
        panel.add( loginButton );

        //添加页面输出
        JTextArea area = new JTextArea();
        area.setBounds( 100, 110, 165, 100 );
        panel.add( area );

        loginButton.addActionListener( new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                int a = Integer.parseInt( firstNumber.getText() );
                int b = Integer.parseInt( secondNumber.getText() );
                String str = "和为" + (a + b) +
                            "\n差为" + (a - b) +
                            "\n积为" + (a * b) +
                            "\n商为" + (a / b);
                area.append( str );
            }
        } );

    }
}

2. 编写一个应用程序，设计4个按钮，分别命名为“加”、“减”、“乘”、“除”，有3个文本框。单击相应的按钮，将两个文本框的数字做运算，在第三个文本框中显示结果。

/*
 * Created by JFormDesigner on Thu Jun 07 19:46:32 CST 2018
 */

package swing;

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

/**
 * @author ç??å?©å?½
 */
public class Test6 extends JFrame {

    public static void main(String[] args) {
        Test6 one = new Test6();
        one.setVisible( true );
    }
    public Test6() {
        initComponents();
    }

    private void button1ActionPerformed(ActionEvent e) {
        // TODO add your code here
        int a = Integer.parseInt( textField1.getText() );
        int b = Integer.parseInt( textField2.getText() );
        String  str1 = ""+(a+b);
        textArea1.append( str1 );
    }

    private void button2ActionPerformed(ActionEvent e) {
        // TODO add your code here
        int a = Integer.parseInt( textField1.getText() );
        int b = Integer.parseInt( textField2.getText() );
        String  str1 = ""+(a-b);
        textArea1.append( str1 );
    }

    private void button3ActionPerformed(ActionEvent e) {
        // TODO add your code here
        int a = Integer.parseInt( textField1.getText() );
        int b = Integer.parseInt( textField2.getText() );
        String  str1 = ""+(a*b);
        textArea1.append( str1 );
    }

    private void button4ActionPerformed(ActionEvent e) {
        // TODO add your code here
        int a = Integer.parseInt( textField1.getText() );
        int b = Integer.parseInt( textField2.getText() );
        String  str1 = ""+(a/b);
        textArea1.append( str1 );
    }

    private void initComponents() {
        // JFormDesigner - Component initialization - DO NOT MODIFY  //GEN-BEGIN:initComponents
        // Generated using JFormDesigner Evaluation license - ç??å?©å?½
        dialogPane = new JPanel();
        contentPanel = new JPanel();
        label1 = new JLabel();
        textField1 = new JTextField();
        label2 = new JLabel();
        textField2 = new JTextField();
        button1 = new JButton();
        scrollPane1 = new JScrollPane();
        textArea1 = new JTextArea();
        button2 = new JButton();
        button3 = new JButton();
        button4 = new JButton();
        buttonBar = new JPanel();

        //======== this ========
        Container contentPane = getContentPane();
        contentPane.setLayout(new BorderLayout());

        //======== dialogPane ========
        {
            dialogPane.setBorder(new EmptyBorder(12, 12, 12, 12));

            // JFormDesigner evaluation mark
            dialogPane.setBorder(new javax.swing.border.CompoundBorder(
                new javax.swing.border.TitledBorder(new javax.swing.border.EmptyBorder(0, 0, 0, 0),
                    "JFormDesigner Evaluation", javax.swing.border.TitledBorder.CENTER,
                    javax.swing.border.TitledBorder.BOTTOM, new java.awt.Font("Dialog", java.awt.Font.BOLD, 12),
                    java.awt.Color.red), dialogPane.getBorder())); dialogPane.addPropertyChangeListener(new java.beans.PropertyChangeListener(){public void propertyChange(java.beans.PropertyChangeEvent e){if("border".equals(e.getPropertyName()))throw new RuntimeException();}});

            dialogPane.setLayout(new BorderLayout());

            //======== contentPanel ========
            {
                contentPanel.setLayout(new GridBagLayout());
                ((GridBagLayout)contentPanel.getLayout()).columnWidths = new int[] {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
                ((GridBagLayout)contentPanel.getLayout()).rowHeights = new int[] {0, 0, 0, 0, 0, 0, 0, 0};
                ((GridBagLayout)contentPanel.getLayout()).columnWeights = new double[] {0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0E-4};
                ((GridBagLayout)contentPanel.getLayout()).rowWeights = new double[] {0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0E-4};

                //---- label1 ----
                label1.setText("\u7b2c\u4e00\u4e2a\u6570");
                contentPanel.add(label1, new GridBagConstraints(1, 1, 1, 1, 0.0, 0.0,
                    GridBagConstraints.CENTER, GridBagConstraints.BOTH,
                    new Insets(0, 0, 5, 5), 0, 0));

                //---- textField1 ----
                textField1.setText("                            ");
                contentPanel.add(textField1, new GridBagConstraints(3, 1, 6, 1, 0.0, 0.0,
                    GridBagConstraints.CENTER, GridBagConstraints.BOTH,
                    new Insets(0, 0, 5, 5), 0, 0));

                //---- label2 ----
                label2.setText("\u7b2c\u4e8c\u4e2a\u6570");
                contentPanel.add(label2, new GridBagConstraints(1, 2, 1, 1, 0.0, 0.0,
                    GridBagConstraints.CENTER, GridBagConstraints.BOTH,
                    new Insets(0, 0, 5, 5), 0, 0));

                //---- textField2 ----
                textField2.setText("                       ");
                contentPanel.add(textField2, new GridBagConstraints(3, 2, 6, 1, 0.0, 0.0,
                    GridBagConstraints.CENTER, GridBagConstraints.BOTH,
                    new Insets(0, 0, 5, 5), 0, 0));

                //---- button1 ----
                button1.setText("\u52a0");
                button1.addActionListener(e -> button1ActionPerformed(e));
                contentPanel.add(button1, new GridBagConstraints(1, 3, 1, 1, 0.0, 0.0,
                    GridBagConstraints.CENTER, GridBagConstraints.BOTH,
                    new Insets(0, 0, 5, 5), 0, 0));

                //======== scrollPane1 ========
                {

                    //---- textArea1 ----
                    textArea1.setText("          ");
                    scrollPane1.setViewportView(textArea1);
                }
                contentPanel.add(scrollPane1, new GridBagConstraints(3, 3, 11, 4, 0.0, 0.0,
                    GridBagConstraints.CENTER, GridBagConstraints.BOTH,
                    new Insets(0, 0, 0, 0), 0, 0));

                //---- button2 ----
                button2.setText("\u51cf");
                button2.addActionListener(e -> button2ActionPerformed(e));
                contentPanel.add(button2, new GridBagConstraints(1, 4, 1, 1, 0.0, 0.0,
                    GridBagConstraints.CENTER, GridBagConstraints.BOTH,
                    new Insets(0, 0, 5, 5), 0, 0));

                //---- button3 ----
                button3.setText("\u4e58");
                button3.addActionListener(e -> button3ActionPerformed(e));
                contentPanel.add(button3, new GridBagConstraints(1, 5, 1, 1, 0.0, 0.0,
                    GridBagConstraints.CENTER, GridBagConstraints.BOTH,
                    new Insets(0, 0, 5, 5), 0, 0));

                //---- button4 ----
                button4.setText("\u9664");
                button4.addActionListener(e -> button4ActionPerformed(e));
                contentPanel.add(button4, new GridBagConstraints(1, 6, 1, 1, 0.0, 0.0,
                    GridBagConstraints.CENTER, GridBagConstraints.BOTH,
                    new Insets(0, 0, 0, 5), 0, 0));
            }
            dialogPane.add(contentPanel, BorderLayout.CENTER);

            //======== buttonBar ========
            {
                buttonBar.setBorder(new EmptyBorder(12, 0, 0, 0));
                buttonBar.setLayout(new GridBagLayout());
                ((GridBagLayout)buttonBar.getLayout()).columnWidths = new int[] {0, 80};
                ((GridBagLayout)buttonBar.getLayout()).columnWeights = new double[] {1.0, 0.0};
            }
            dialogPane.add(buttonBar, BorderLayout.SOUTH);
        }
        contentPane.add(dialogPane, BorderLayout.CENTER);
        pack();
        setLocationRelativeTo(getOwner());
        // JFormDesigner - End of component initialization  //GEN-END:initComponents
    }

    // JFormDesigner - Variables declaration - DO NOT MODIFY  //GEN-BEGIN:variables
    // Generated using JFormDesigner Evaluation license - ç??å?©å?½
    private JPanel dialogPane;
    private JPanel contentPanel;
    private JLabel label1;
    private JTextField textField1;
    private JLabel label2;
    private JTextField textField2;
    private JButton button1;
    private JScrollPane scrollPane1;
    private JTextArea textArea1;
    private JButton button2;
    private JButton button3;
    private JButton button4;
    private JPanel buttonBar;
    // JFormDesigner - End of variables declaration  //GEN-END:variables
}

3. 编写一个有两个线程的程序，第一个线程用来计算2~100000之间的质数及个数，第二个线程用来计算100000~200000之间的质数及个数。

package swing;

/**
 * @Author liguo
 * @Description
 * @Data 2018-06-07 9:26
 */
public class Thread extends java.lang.Thread {

    public static void run(int min, int max) {
        int i, j;
        for (i = min; i <= max; i++) {
            for (j = 2; j < (int) Math.sqrt( i ); j++) {
                if (i % j == 0)
                    break;
                else
                    System.out.print( i );
                count++;
            }
            System.out.println( min + "  " + max + ":" + count );
        }
    }

    private int min, max;
    private static int count = 0;

    public static void main(String[] args) {
        Thread t1 = new Thread();
        Thread t2 = new Thread();
        t1.run( 2, 100000 );
        t2.run( 100000, 20000 );
    }
}

原文地址：https://www.cnblogs.com/liguo-wang/p/9152591.html