java入门程序题及源码5

一.实验目的 理解并掌握线程与同步 学会使用 java实现 GUI设计 学会使用 awt和 Swing组件的一般功能 二.实验内容 实验题目一： 分别建立两个线程，产生并显示100,10000和2000,3000之间的随机数各 10000 个，并分别求和显示出来 1程序源代码 import java.util.*; class MyThread1 implements Runnable public void run() Random r=new Random(); int n,i=0; long p=0; do n = r.nextInt(9901)+100; p = p+n; System.out.printf(“%d “,n); i+; while( i10000); System.out.println(); System.out.println(“the sum of 10000 number between 100,10000 is:“+p); class MyThread2 implements Runnable public void run() Random r=new Random(); int n,i=0; long p=0; do n = r.nextInt(1001)+2000; p = p+n; System.out.printf(“%d “,n); i+; while( i10000); System.out.println(); System.out.println(“the sum of 10000 number between 2000,3000 is:“+p); public class title5_1 public static void main(String args) System.out.println(“the random numbers are shown as follows:“); MyThread1 holy=new MyThread1(); Thread t1=new Thread(holy); t1.start(); MyThread2 shit=new MyThread2(); Thread t2=new Thread(shit); t2.start(); 2实验结果 实验题目二： 建立两个线程分别不断读取两个文本文件中的数据并求和，当为-1 时结束并显 示求和结果。 1程序源代码 import java.io.*; import java.util.*; class sum private int sum=0; synchronized void sum(int i) sum=sum+i; public void sum1() System.out.println(“=“+sum); class MyThread1 implements Runnable sum sum2; MyThread1(sum sum2) this.sum2=sum2; new Thread(this).start(); public void run() try Scanner sc1=new Scanner(new File(“num1.txt“); int n; while(sc1.hasNextInt() if(n=sc1.nextInt()=-1) sum2.sum1(); System.exit(-1); else System.out.printf(“+%d“,n); try Thread.sleep(300); catch(InterruptedException e) sum2.sum(n); catch(Exception e) class MyThread2 implements Runnable sum sum2; MyThread2(sum sum2) this.sum2=sum2; new Thread(this).start(); public void run() try Scanner sc2=new Scanner(new File(“num2.txt“); int n; while(sc2.hasNextInt() if(n=sc2.nextInt()=-1) sum2.sum1(); System.exit(-1); else System.out.printf(“+%d“,n); try Thread.sleep(300); catch(InterruptedException e) sum2.sum(n); catch(Exception e) public class title5_2 public static void main(String args) System.out.printf(“sum=0“); sum sum1=new sum(); MyThread1 holy=new MyThread1(sum1); MyThread2 shit=new MyThread2(sum1); 2.实验结果 实验题目三： 请编写一个 swing 图形界面程序，设计一个计算器，要求如下： (1) 支持+、-、*、/ 和%等常用运算符； (2) 支持 sin、cos、max、min、pow 和 sqrt 等常用函数； (3) 支持十进制、八进制、十六进制和二进制之间的转换。 1程序源代码 import javax.swing.*; import java.awt.*; import java.awt.event.*; public class title5_3 extends JFrame implements ActionListener double num1, num2, num3; boolean end, add, mul, sub, div, sin, cos, max, min, Hex, Oct, Bin; JTextField t = new JTextField(“0“); JButton button = new JButton24; JPanel p1 = new JPanel(); JPanel p2 = new JPanel(); public title5_3() setTitle(“计算器“); setResizable(false); setBounds(100, 100, 330, 280); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); add(p1, “North“); t.setEditable(false); t.setColumns(28); t.setHorizontalAlignment(JTextField.RIGHT); p1.add(t); GridLayout l = new GridLayout(4, 0); l.setVgap(10); l.setHgap(10); p2.setLayout(l); add(p2, “Center“); button0 = new JButton(“1“); button1 = new JButton(“2“); button2 = new JButton(“3“); button3 = new JButton(“sin“); button3.setMargin(new Insets(0,0,0,0); button4 = new JButton(“Oct“); button4.setMargin(new Insets(0,0,0,0); button5 = new JButton(“+“); button6 = new JButton(“4“); button7 = new JButton(“5“); button8 = new JButton(“6“); button9 = new JButton(“cos“); button9.setMargin(new Insets(0,0,0,0); button10 = new JButton(“Hex“); button10.setMargin(new Insets(0,0,0,0); button11 = new JButton(“-“); button12 = new JButton(“7“); button13 = new JButton(“8“); button14 = new JButton(“9“); button15 = new JButton(“max“); button15.setMargin(new Insets(0,0,0,0); button16 = new JButton(“Bin“); button16.setMargin(new Insets(0,0,0,0); button17 = new JButton(“*“); button18 = new JButton(“0“); button19 = new JButton(“.“); button20 = new JButton(“=“); button21 = new JButton(“min“); button21.setMargin(new Insets(0,0,0,0); button22 = new JButton(“,“); button23 = new JButton(“/“); for (JButton x : button) p2.add(x); x.addActionListener(this); JLabel ll = new JLabel(); ll.setPreferredSize(new Dimension(10, 0); add(ll, “West“); JLabel rl = new JLabel(); rl.setPreferredSize(new Dimension(10, 0); add(rl, “East“); setVisible(true); public static void main(String args) title5_3 calculator = new title5_3(); public void num(int i) String s = String.valueOf(i); if (end) t.setText(“0“); end = false; if ( (t.getText().equals(“0“) t.setText(s); else String str = t.getText() + s; t.setText(str); public void sign(int i) if (i = 1) add = true; mul = false; sub = false; div = false; sin = false; cos = false; max = false; min = false; Hex = false; Oct = false; Bin = false; if (i = 2) add = false; mul = false; sub = true; div = false; sin = false; cos = false; max = false; min = false; Hex = false; Oct = false; Bin = false; if (i = 3) add = false; mul = true; sub = false; div = false; sin = false; cos = false; max = false; min = false; Hex = false; Oct = false; Bin = false; if (i = 4) add = false; mul = false; sub = false; div = true; sin = false; cos = false; max = false; min = false; Hex = false; Oct = false; Bin = false; if (i = 5) add = false; mul = false; sub = false; div = false; sin = true; cos = false; max = false; min = false; Hex = false; Oct = false; Bin = false; if (i = 6) add = false; mul = false; sub = false; div = false; sin = false; cos = true; max = false; min = false; Hex = false; Oct = false; Bin = false; if (i = 7) add = false; mul = false; sub = false; div = false; sin = false; cos = false; max = true; min = false; Hex = false; Oct = false; Bin = false; if (i = 8) add = false; mul = false; sub = false; div = false; sin = false; cos = false; max = false; min = true; Hex = false; Oct = false; Bin = false; if (i = 9) add = false; mul = false; sub = false; div = false; sin = false; cos = false; max = false; min = false; Hex = true; Oct = false; Bin = false; if (i = 10) add = false; mul = false; sub = false; div = false; sin = false; cos = false; max = false; min = false; Hex = false; Oct = true; Bin = false; if (i = 11) add = false; mul = false; sub = false; div = false; sin = false; cos = false; max = false; min = false; Hex = false; Oct = false; Bin = true; if(i!=5) end = true; public void point() String s; if (t.getText().indexOf(.) 0) s = t.getText() + “.“; t.setText(s); public void sepa() String s; s = t.getText() + “,“; t.setText(s); public void sin() t.setText(“sin“); public void cos() t.setText(“cos“); public void max() t.setText(“max“); public void min() t.setText(“min“); public void eql() String s=“; int k; /计算 if(add|div|mul|sub) num2 = Double.parseDouble(t.getText(); if(max|min) s = t.getText(); k = s.indexOf(“,“); num1 = Double.parseDouble(s.substring(0,k); num2 = Double.parseDouble(s.substring(k+1,s.length(); if (add) num3 = num1 + num2; if (mul) num3 = num1 * num2; if (sub) num3 = num1 - num2; if (div) num3 = num1 / num2; if (sin) num3 = Math.sin(num2/180*Math.PI); if (cos) num3 = Math.cos(num2/180*Math.PI); if (Oct) s = Integer.toOctalString(int)num1); if (Hex) s = Integer.toHexString(int)num1); if (Bin) s = Integer.toBinaryString(int)num1); if (max) num3 = Math.max(num1,num2); if (min) num3 = Math.min(num1,num2); if(!(Oct|Hex|Bin) s = String.valueOf(num3); t.setText(s); end = true; public void actionPerformed(ActionEvent e) if (e.getSource() = button0) num(1); if (e.getSource() = button1) num(2); if (e.getSource() = button2) num(3); if (e.getSource() = button6) num(4); if (e.getSource() = button7) num(5); if (e.getSource() = button8) num(6); if (e.getSource() = button12) num(7); if (e.getSource() = button13) num(8); if (e.getSource() = button14) num(9); if (e.getSource() = button18) num(0); if (e.getSource() = button5) sign(1); if (e.getSource() = button11) sign(2); if (e.getSource() = button17) sign(3); if (e.getSource() = button23) sign(4); if (e.getSource() = button19) point(); if (e.getSource() = button20) eql(); if (e.getSource() = button3) sin(); sign(5); if (e.getSource() = button9) cos(); sign(6); if (e.getSource() = button4) sign(10); if (e.getSource() = button10) sign(9); if (e.getSource() = button16) sign(11); if (e.getSource() = button15) max(); sign(7); if (e.getSource() = button21) min(); sign(8); if (e.getSource() = button22) sepa(); 2.试验结果 实验题目四： 编写一个 swing 图形界面程序能将多行文本框中的内容保存到一个文本文件， 也能将一个文本文件的内容显示到这个多行文本框中。 1程序源代码 import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.io.*; import java.util.*; public class title5_4 public static void main(String args) JFrame frame = new JFrame(); FlowLayout flow = new FlowLayout(); final JTextArea textArea1 = new JTextArea(20, 30); JButton button2 = new JButton(“写入 holyshit.txt“); JButton