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public class Test {
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double result = 0;
boolean start = true;
String lastCommand = "+";// 最终的符号
Font font = new Font(null, Font.PLAIN, 25);
Font font2 = new Font(null, Font.PLAIN, 20);
JFrame frame = new JFrame("简易计算器");
JPanel panel1 = new JPanel();
JPanel panel2 = new JPanel();
JPanel panel3 = new JPanel();
JPanel panel4 = new JPanel();
JPanel panel5 = new JPanel();
JTextField text = new JTextField("");
JButton b0 = new JButton("0");
JButton b1 = new JButton("1");
JButton b2 = new JButton("2");
JButton b3 = new JButton("3");
JButton b4 = new JButton("4");
JButton b5 = new JButton("5");
JButton b6 = new JButton("6");
JButton b7 = new JButton("7");
JButton b8 = new JButton("8");
JButton b9 = new JButton("9");
JButton a1 = new JButton("+");
JButton a2 = new JButton("-");
JButton a3 = new JButton("*");
JButton a4 = new JButton("/");
JButton a5 = new JButton("=");
JButton a6 = new JButton(".");
JButton a7 = new JButton("清零");
JButton a8 = new JButton("取消");
JButton a9 = new JButton("sqrt");
JButton a10 = new JButton("+/-");
public void set() {
frame.setSize(400, 350);
frame.setLayout(new GridLayout(5, 1, 2, 2));
panel1.setBackground(Color.black);
panel2.setBackground(Color.red);
panel3.setBackground(Color.blue);
panel4.setBackground(Color.green);
panel5.setBackground(Color.yellow);
panel1.setLayout(new BorderLayout());
panel1.add(text, "Center");
panel2.setLayout(new GridLayout(1, 5, 1, 1));
panel3.setLayout(new GridLayout(1, 5, 1, 1));
panel4.setLayout(new GridLayout(1, 5, 1, 1));
panel5.setLayout(new GridLayout(1, 5, 1, 1));
text.setHorizontalAlignment(JTextField.RIGHT);
b0.setFont(font);
b1.setFont(font);
b2.setFont(font);
b3.setFont(font);
b4.setFont(font);
b5.setFont(font);
b6.setFont(font);
b7.setFont(font);
b8.setFont(font);
b9.setFont(font);
a1.setFont(font);
a2.setFont(font);
a3.setFont(font);
a4.setFont(font);
a5.setFont(font);
a6.setFont(font);
a7.setFont(font2);
a8.setFont(font2);
a9.setFont(font);
a10.setFont(font);
frame.setVisible(true);
}
public void addComponent() {
panel2.add(b7);
panel2.add(b8);
panel2.add(b9);
panel2.add(a4);
panel2.add(a7);
panel3.add(b4);
panel3.add(b5);
panel3.add(b6);
panel3.add(a3);
panel3.add(a8);
panel4.add(b1);
panel4.add(b2);
panel4.add(b3);
panel4.add(a2);
panel4.add(a9);
panel5.add(b0);
panel5.add(a10);
panel5.add(a6);
panel5.add(a1);
panel5.add(a5);
frame.add(panel1);
frame.add(panel2);
frame.add(panel3);
frame.add(panel4);
frame.add(panel5);
}
public void addListener() {
b0.addActionListener(new InsertAction());
b1.addActionListener(new InsertAction());
b2.addActionListener(new InsertAction());
b3.addActionListener(new InsertAction());
b4.addActionListener(new InsertAction());
b5.addActionListener(new InsertAction());
b6.addActionListener(new InsertAction());
b7.addActionListener(new InsertAction());
b8.addActionListener(new InsertAction());
b9.addActionListener(new InsertAction());
a1.addActionListener(new CommandAction());
a2.addActionListener(new CommandAction());
a3.addActionListener(new CommandAction());
a4.addActionListener(new CommandAction());
a5.addActionListener(new CommandAction());
a6.addActionListener(new InsertAction());
a7.addActionListener(new InsertAction());
a8.addActionListener(new InsertAction());
a9.addActionListener(new CommandAction());
a10.addActionListener(new InsertAction());
}
public void go() {
this.set();
this.addComponent();
this.addListener();
}
class InsertAction implements ActionListener {
public void actionPerformed(ActionEvent event1) {
String input = event1.getActionCommand();
if (start) {
text.setText("");
start = false;
if (input.equals("+/-"))
text.setText(text.getText() + "-");
}
if (!input.equals("+/-")) {
if (input.equals("取消")) {
String str = text.getText();
if (str.length() 0)
text.setText(str.substring(0, str.length() - 1));
} else if (input.equals("清零")) {
text.setText("0");
lastCommand = "+";
start = true;
result = 0;
} else
text.setText(text.getText() + input);
}
}
}
class CommandAction implements ActionListener {
public void actionPerformed(ActionEvent event2) {
String command = event2.getActionCommand();
if (start) {
lastCommand = command;
} else { // Double data=new Double(text.getText());
calculator(Double.parseDouble(text.getText()));
lastCommand = command;
start = true;
}
}
}
public void calculator(double x) {
if (lastCommand.equals("+"))
result += x;
else if (lastCommand.equals("-"))
result -= x;
else if (lastCommand.equals("*"))
result *= x;
else if (lastCommand.equals("/"))
result /= x;
else if (lastCommand.equals("="))
result = x;
else if (lastCommand.equals("sqrt"))
result = Math.sqrt(x);
text.setText("" + result);
}
public static void main(String[] args) {
Test a = new Test();
a.go();
}
}
import java.util.Arrays;
public class Array2 {
public static void main(String[] args) {
//声明一个名为myArray的数组,该数组有2行,每行列数不等,并为其分配内存空间
int[][] myArray = new int[2][];
myArray[0] = new int[5]; //第一行有5个元素,并为其分配内存空间
myArray[1] = new int[10]; //第二行有10个元素,并为其分配内存空间
for (int j = 0; j myArray[0].length; j++)
//用1-10之间的随机整数给第一行元素赋值
myArray[0][j] = (int)(Math.random() * 10);
//用100-200之间的随机整数给第二行元素赋值
for (int j=0; j myArray[1].length; j++)
myArray[1][j]=(int)(Math.random() * 100 + 100);
for (int i=0; i myArray.length; i++){ //输出myArray数组各元素的值
for (int j=0; j myArray[i].length; j++){
System.out.print(myArray[i][j]+" ");
}
System.out.println();
}
Arrays.sort(myArray[0]); //对第一行元素排序
Arrays.sort(myArray[1]); //对第二行元素排序
System.out.println("\n排序后的数组元素: ");
for (int i=0; imyArray.length;i++){ //再次输出myArray数组各元素的值
for (int j=0; jmyArray[i].length;j++){
System.out.print(myArray[i][j]+" ");
}
System.out.println();
}
}
}
7 3 9 6 7
103 165 166 148 103 179 128 109 120 156
排序后的数组元素:
3 6 7 7 9
103 103 109 120 128 148 156 165 166 179
package tuxingjiemian;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.io.File;
import java.io.PrintStream;
public class jishiben extends JFrame {
JPanel jp=new JPanel();
JFrame find_replace=new JFrame();
JMenu file=new JMenu("文件");
JMenu edit=new JMenu("编辑");
JMenu help=new JMenu("帮助");
JMenuBar menubar=new JMenuBar();
JTextArea aa=new JTextArea();
class Open implements ActionListener {
public void actionPerformed(ActionEvent e) {
JFileChooser jf= new JFileChooser();
jf.showOpenDialog(jishiben.this);
try {
PrintStream p=new PrintStream(jf.getSelectedFile().getPath());
} catch (Exception e2) {
}
}
}
class Save implements ActionListener {
public void actionPerformed(ActionEvent e) {
JFileChooser jf= new JFileChooser();
jf.showSaveDialog(jishiben.this);
try {
PrintStream p=new PrintStream(jf.getSelectedFile().getPath());
} catch (Exception e2) {
}
}
}
public jishiben(){
this.setTitle("记事本");
this.setSize(500, 500);
this.setLayout(new BorderLayout());
JMenuItem open=new JMenuItem("打开");
open.addActionListener(new Open());
JMenuItem save=new JMenuItem("保存");
save.addActionListener(new Save());
JMenuItem exit=new JMenuItem("退出");
exit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
file.add(open);
file.add(save);
file.addSeparator();
file.add(exit);
menubar.add(file);
this.add(new JScrollPane(aa),BorderLayout.CENTER);
JMenuItem copy=new JMenuItem("复制");
JMenuItem past=new JMenuItem("粘贴");
JMenuItem delete=new JMenuItem("删除");
JMenuItem find=new JMenuItem("查找");
JMenuItem replace=new JMenuItem("替换");
copy.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
jishiben.this.aa.copy();
}
});
past.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
jishiben.this.aa.paste();
}
});
delete.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
jishiben.this.aa.replaceSelection(null);
}
});
edit.add(copy);
edit.add(past);
edit.add(delete);
edit.add(find);
edit.add(replace);
menubar.add(edit);
help.add(new JMenuItem("帮助"));
menubar.add(help);
this.add(menubar,BorderLayout.NORTH);
this.setVisible(true);
this.setDefaultCloseOperation(this.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new jishiben();
}
};
1.JavaPow.java
import java.util.Scanner;
public class JavaPow {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print("请输入一个数求平方:");
double num = sc.nextDouble();
System.out.println(num + "的平方结果是:" + Math.pow(num, 2));
}
}
2.CompareTest.java
public class CompareTest {
public static void main(String[] args) {
int a = 10, b = 8;
if(ab){
System.out.println("排序结果是:"+b+"\t"+a);
}else{
System.out.println("排序结果是:"+a+"\t"+b);
}
}
}
3.RateMoney.java
import java.util.Scanner;
public class RateMoney {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
double money=0;
double rate=0;
System.out.print("请输入汇款金额：");
money=sc.nextDouble();
if(money0){
rate=0;
}
else if(money0money=100){
rate=1;
}else if(money100money=5000){
rate=money/100;
}else{
rate=50;
}
System.out.println("汇"+money+"元钱需汇款费："+rate+"元");
}
}
三个都已经写出来了..
你好好看看吧!!
祝你早日成功!