具有按键响应的Java计算器
所以我写了这个剧本;这是我找到并拼凑起来的计算器的一个大杂烩具有按键响应的Java计算器,java,swing,Java,Swing,所以我写了这个剧本;这是我找到并拼凑起来的计算器的一个大杂烩 keylister来自Java-oracle-.com网站。顺便说一句,我对这一点非常陌生,不知道我在做什么 我试图使用keylister来允许击键使计算器工作,这样就不必点击输入;当前脚本已编译,但无法在中键入输入。。。我做得对吗 import java.awt.*; import javax.swing.*; import java.awt.event.*; import java.awt.BorderLayout; import
keylister
来自Java-oracle-.com网站。顺便说一句,我对这一点非常陌生,不知道我在做什么
我试图使用keylister
来允许击键使计算器工作,这样就不必点击输入;当前脚本已编译,但无法在中键入输入。。。我做得对吗
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
public class Calculator extends JFrame implements KeyListener, ActionListener {
JPanel[] row = new JPanel[5];
JButton[] button = new JButton[19];
String[] buttonstring = {"7", "8", "9", "+",
"4", "5", "6", "-",
"1", "2", "3", "*",
".", "/", "C", "SR",
"+/-", "=", "0"};
int[] dimW = {300,45,100,90};
int[] dimH = {35, 40};
Dimension displayDimension = new Dimension(dimW[0], dimH[0]);
Dimension regularDimension = new Dimension(dimW[1], dimH[1]);
Dimension rColumnDimension = new Dimension(dimW[2], dimH[1]);
Dimension zeroButDimension = new Dimension(dimW[3], dimH[1]);
boolean[] function = new boolean[4];
double[] temporary = {0, 0};
JTextArea display = new JTextArea(1,20);
Font font = new Font("Times new Roman", Font.BOLD, 14);
JTextArea displayArea;
JTextField typingArea;
static final String newline = System.getProperty("line.separator");
//Uncomment this if you wish to turn off focus
//traversal. The focus subsystem consumes
//focus traversal keys, such as Tab and Shift Tab.
//If you uncomment the following line of code, this
//disables focus traversal and the Tab events will
//become available to the key event listener.
//typingArea.setFocusTraversalKeysEnabled(false);
Calculator() {
super("Calculator");
setDesign();
setSize(380, 250);
setResizable(false);
setDefaultCloseOperation(EXIT_ON_CLOSE);
GridLayout grid = new GridLayout(5,5);
setLayout(grid);
for(int i = 0; i < 4; i++)
function[i] = false;
FlowLayout f1 = new FlowLayout(FlowLayout.CENTER);
FlowLayout f2 = new FlowLayout(FlowLayout.CENTER,1,1);
for(int i = 0; i < 5; i++)
row[i] = new JPanel();
row[0].setLayout(f1);
for(int i = 1; i < 5; i++)
row[i].setLayout(f2);
for(int i = 0; i < 19; i++) {
button[i] = new JButton();
button[i].setText(buttonstring[i]);
button[i].setFont(font);
button[i].addActionListener(this);
}
display.setFont(font);
display.setEditable(false);
display.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
display.setPreferredSize(displayDimension);
for(int i = 0; i < 14; i++)
button[i].setPreferredSize(regularDimension);
for(int i = 14; i < 18; i++)
button[i].setPreferredSize(rColumnDimension);
button[18].setPreferredSize(zeroButDimension);
row[0].add(display);
add(row[0]);
for(int i = 0; i < 4; i++)
row[1].add(button[i]);
row[1].add(button[14]);
add(row[1]);
for(int i = 4; i < 8; i++)
row[2].add(button[i]);
row[2].add(button[15]);
add(row[2]);
for(int i = 8; i < 12; i++)
row[3].add(button[i]);
row[3].add(button[16]);
add(row[3]);
row[4].add(button[18]);
for(int i = 12; i < 14; i++)
row[4].add(button[i]);
row[4].add(button[17]);
add(row[4]);
setVisible(true);
}
public void clear() {
try {
display.setText("");
for(int i = 0; i < 4; i++)
function[i] = false;
for(int i = 0; i < 2; i++)
temporary[i] = 0;
} catch(NullPointerException e) {
}
}
public void getSqrt() {
try {
double value = Math.sqrt(Double.parseDouble(display.getText()));
display.setText(Double.toString(value));
} catch(NumberFormatException e) {
}
}
public void getPosNeg() {
try {
double value = Double.parseDouble(display.getText());
if(value != 0) {
value = value * (-1);
display.setText(Double.toString(value));
}
else {
}
} catch(NumberFormatException e) {
}
}
public void getResult() {
double result = 0;
temporary[1] = Double.parseDouble(display.getText());
String temp0 = Double.toString(temporary[0]);
String temp1 = Double.toString(temporary[1]);
try {
if(temp0.contains("-")) {
String[] temp00 = temp0.split("-", 2);
temporary[0] = (Double.parseDouble(temp00[1]) * -1);
}
if(temp1.contains("-")) {
String[] temp11 = temp1.split("-", 2);
temporary[1] = (Double.parseDouble(temp11[1]) * -1);
}
} catch(ArrayIndexOutOfBoundsException e) {
}
try {
if(function[2] == true)
result = temporary[0] * temporary[1];
else if(function[3] == true)
result = temporary[0] / temporary[1];
else if(function[0] == true)
result = temporary[0] + temporary[1];
else if(function[1] == true)
result = temporary[0] - temporary[1];
display.setText(Double.toString(result));
for(int i = 0; i < 4; i++)
function[i] = false;
} catch(NumberFormatException e) {
}
}
public final void setDesign() {
try {
UIManager.setLookAndFeel(
"com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
} catch(Exception e) {
}
}
@Override
public void actionPerformed(ActionEvent ae) {
if(ae.getSource() == button[0])
display.append("7");
if(ae.getSource() == button[1])
display.append("8");
if(ae.getSource() == button[2])
display.append("9");
if(ae.getSource() == button[3]) {
//add function[0]
temporary[0] = Double.parseDouble(display.getText());
function[0] = true;
display.setText("");
}
if(ae.getSource() == button[4])
display.append("4");
if(ae.getSource() == button[5])
display.append("5");
if(ae.getSource() == button[6])
display.append("6");
if(ae.getSource() == button[7]) {
//subtract function[1]
temporary[0] = Double.parseDouble(display.getText());
function[1] = true;
display.setText("");
}
if(ae.getSource() == button[8])
display.append("1");
if(ae.getSource() == button[9])
display.append("2");
if(ae.getSource() == button[10])
display.append("3");
if(ae.getSource() == button[11]) {
//multiply function[2]
temporary[0] = Double.parseDouble(display.getText());
function[2] = true;
display.setText("");
}
if(ae.getSource() == button[12])
display.append(".");
if(ae.getSource() == button[13]) {
//divide function[3]
temporary[0] = Double.parseDouble(display.getText());
function[3] = true;
display.setText("");
}
if(ae.getSource() == button[14])
clear();
if(ae.getSource() == button[15])
getSqrt();
if(ae.getSource() == button[16])
getPosNeg();
if(ae.getSource() == button[17])
getResult();
if(ae.getSource() == button[18])
display.append("0");
}
public void contentPane() {
typingArea = new JTextField(20);
typingArea.addKeyListener(this);
displayArea = new JTextArea();
displayArea.setEditable(false);
JScrollPane scrollPane = new JScrollPane(displayArea);
scrollPane.setPreferredSize(new Dimension(375, 125));
getContentPane().add(typingArea, BorderLayout.PAGE_START);
getContentPane().add(scrollPane, BorderLayout.CENTER);
}
public void keyTyped(KeyEvent e) {
displayInfo(e, "KEY TYPED: ");
}
/** Handle the key pressed event from the text field. */
public void keyPressed(KeyEvent e) {
displayInfo(e, "KEY PRESSED: ");
}
/** Handle the key released event from the text field. */
public void keyReleased(KeyEvent e) {
displayInfo(e, "KEY RELEASED: ");
}
/** Handle the button click. */
public void ActionPerformed(ActionEvent e) {
//Clear the text components.
displayArea.setText("");
typingArea.setText("");
//Return the focus to the typing area.
typingArea.requestFocusInWindow();
}
private void displayInfo(KeyEvent e, String keyStatus){
//You should only rely on the key char if the event
//is a key typed event.
int id = e.getID();
String keyString;
if (id == KeyEvent.KEY_TYPED) {
char c = e.getKeyChar();
keyString = "key character = '" + c + "'";
} else {
int keyCode = e.getKeyCode();
keyString = "key code = " + keyCode
+ " ("
+ KeyEvent.getKeyText(keyCode)
+ ")";
}
int modifiersEx = e.getModifiersEx();
String modString = "extended modifiers = " + modifiersEx;
String tmpString = KeyEvent.getModifiersExText(modifiersEx);
if (tmpString.length() > 0) {
modString += " (" + tmpString + ")";
} else {
modString += " (no extended modifiers)";
}
String actionString = "action key? ";
if (e.isActionKey()) {
actionString += "YES";
} else {
actionString += "NO";
}
String locationString = "key location: ";
int location = e.getKeyLocation();
if (location == KeyEvent.KEY_LOCATION_STANDARD) {
locationString += "standard";
} else if (location == KeyEvent.KEY_LOCATION_LEFT) {
locationString += "left";
} else if (location == KeyEvent.KEY_LOCATION_RIGHT) {
locationString += "right";
} else if (location == KeyEvent.KEY_LOCATION_NUMPAD) {
locationString += "numpad";
} else { // (location == KeyEvent.KEY_LOCATION_UNKNOWN)
locationString += "unknown";
}
displayArea.append(keyStatus + newline
+ " " + keyString + newline
+ " " + modString + newline
+ " " + actionString + newline
+ " " + locationString + newline);
displayArea.setCaretPosition(displayArea.getDocument().getLength());
}
public static void main(String[] arguments) {
Calculator c = new Calculator();
}
}
import java.awt.*;
导入javax.swing.*;
导入java.awt.event.*;
导入java.awt.BorderLayout;
导入java.awt.Container;
导入java.awt.Dimension;
公共类计算器扩展JFrame实现KeyListener、ActionListener{
JPanel[]行=新JPanel[5];
JButton[]按钮=新JButton[19];
字符串[]按钮字符串={“7”,“8”,“9”,“+”,
"4", "5", "6", "-",
"1", "2", "3", "*",
“,”/“,“C”,“SR”,
"+/-", "=", "0"};
int[]dimW={300,45100,90};
int[]dimH={35,40};
维度显示维度=新维度(dimW[0],dimH[0]);
尺寸常规尺寸=新尺寸(dimW[1],dimH[1]);
尺寸rColumnDimension=新尺寸(dimW[2],dimH[1]);
尺寸zeroButDimension=新尺寸(dimW[3],dimH[1]);
布尔[]函数=新布尔[4];
double[]临时={0,0};
JTextArea显示=新的JTextArea(1,20);
Font Font=新字体(“Times new Roman”,Font.BOLD,14);
JTextArea显示区;
JTextField-typingArea;
静态最终字符串newline=System.getProperty(“line.separator”);
//如果要关闭焦点,请取消对此的注释
//遍历。焦点子系统消耗
//焦点遍历键,例如Tab和Shift Tab。
//如果取消注释以下代码行,则
//禁用焦点遍历,选项卡事件将
//使键事件侦听器可用。
//键入区域setFocusTraversalKeysEnabled(false);
计算器(){
超级(“计算器”);
setDesign();
设置大小(380250);
可设置大小(假);
setDefaultCloseOperation(关闭时退出);
GridLayout grid=新的GridLayout(5,5);
设置布局(网格);
对于(int i=0;i<4;i++)
函数[i]=假;
FlowLayout f1=新的FlowLayout(FlowLayout.CENTER);
FlowLayout f2=新的FlowLayout(FlowLayout.CENTER,1,1);
对于(int i=0;i<5;i++)
行[i]=新JPanel();
行[0]。设置布局(f1);
对于(int i=1;i<5;i++)
第[i]行。设置布局(f2);
对于(int i=0;i<19;i++){
按钮[i]=新的JButton();
按钮[i].setText(按钮串[i]);
按钮[i]。设置字体(字体);
按钮[i].addActionListener(此);
}
display.setFont(字体);
display.setEditable(false);
display.setComponentOrientation(ComponentOrientation.RIGHT\u至\u LEFT);
display.setPreferredSize(displayDimension);
对于(int i=0;i<14;i++)
按钮[i].setPreferredSize(regularDimension);
对于(int i=14;i<18;i++)
按钮[i].setPreferredSize(rColumnDimension);
按钮[18]。设置首选大小(zeroButDimension);
行[0]。添加(显示);
添加(第[0]行);
对于(int i=0;i<4;i++)
行[1]。添加(按钮[i]);
行[1]。添加(按钮[14]);
添加(第[1]行);
对于(int i=4;i<8;i++)
第[2]行。添加(按钮[i]);
第[2]行。添加(按钮[15]);
添加(第[2]行);
对于(int i=8;i<12;i++)
第[3]行。添加(按钮[i]);
第[3]行。添加(按钮[16]);
添加(第[3]行);
第[4]行。添加(按钮[18]);
对于(int i=12;i<14;i++)
第[4]行。添加(按钮[i]);
第[4]行。添加(按钮[17]);
添加(第[4]行);
setVisible(真);
}
公共空间清除(){
试一试{
display.setText(“”);
对于(int i=0;i<4;i++)
函数[i]=假;
对于(int i=0;i<2;i++)
临时[i]=0;
}捕获(NullPointerException e){
}
}
public void getSqrt(){
试一试{
double value=Math.sqrt(double.parseDouble(display.getText());
display.setText(Double.toString(value));
}捕获(数字格式){
}
}
public void getPosNeg(){
试一试{
double value=double.parseDouble(display.getText());
如果(值!=0){
值=值*(-1);
display.setText(Double.toString(value));
}
否则{
}
}捕获(数字格式){
}
}
public void getResult(){
双结果=0;
临时[1]=Double.parseDouble(display.getText());
字符串temp0=Double.toString(临时[0]);
字符串temp1=Double.toString(临时[1]);
试一试{
if(temp0.contains(“-”){
字符串[]temp00=temp0.split(“-”,2);
临时[0]=(Double.parseDouble(temp00[1])*-1);
}
if(temp1.contains(“-”){
字符串[]temp11=temp1.split(“-”,2);
临时[1]=(Double.parseDouble(temp11[1])*-1);
}
}捕获(阵列索引边界外异常e){
}
试一试{
if(函数[2]==true)
结果=临时[0]*临时[1];
else if(函数[3]==true)
结果=临时[0]/临时[1];
else if(函数[0]==true)
结果=临时[0]+临时[1];
else if(函数[1]==true)
结果=临时[0]-临时[1];
display.setText(Double.toString(结果));
对于(int i=0;i<4;i++)
函数[i]=假;
}捕获(数字格式){
}
}
公共最终设计(){
试一试{
UIManager.setLookAndFeel(
“com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel”);
}捕获(例外e){
}
}
@凌驾
已执行的公共无效行动(行动事件ae){
如果(ae.getSource()==按钮[0])
显示。附加(“7”);
如果(ae.getSource()==按钮[1])
显示。附加(“8”);
if(ae.getSource()==按钮[2])
显示。附加(“9”);
如果(ae.getSource()==butt
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
public class CalculatorPanel extends JPanel
{
private JTextField display;
public CalculatorPanel()
{
Action numberAction = new AbstractAction()
{
@Override
public void actionPerformed(ActionEvent e)
{
display.setCaretPosition( display.getDocument().getLength() );
display.replaceSelection(e.getActionCommand());
}
};
setLayout( new BorderLayout() );
display = new JTextField();
display.setEditable( false );
display.setHorizontalAlignment(JTextField.RIGHT);
add(display, BorderLayout.NORTH);
JPanel buttonPanel = new JPanel();
buttonPanel.setLayout( new GridLayout(0, 5) );
add(buttonPanel, BorderLayout.CENTER);
for (int i = 0; i < 10; i++)
{
String text = String.valueOf(i);
JButton button = new JButton( text );
button.addActionListener( numberAction );
button.setBorder( new LineBorder(Color.BLACK) );
button.setPreferredSize( new Dimension(50, 50) );
buttonPanel.add( button );
InputMap inputMap = button.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
inputMap.put(KeyStroke.getKeyStroke(text), text);
inputMap.put(KeyStroke.getKeyStroke("NUMPAD" + text), text);
button.getActionMap().put(text, numberAction);
}
}
private static void createAndShowUI()
{
// UIManager.put("Button.margin", new Insets(10, 10, 10, 10) );
JFrame frame = new JFrame("Calculator Panel");
frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
frame.add( new CalculatorPanel() );
frame.pack();
frame.setLocationRelativeTo( null );
frame.setVisible(true);
}
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
createAndShowUI();
}
});
}
}