我最近一直在修改我的鞦韆計算器上按鈕的大小時遇到問題。如果你運行它,你會看到一個計算器,幾乎和常規的Windows計算器一樣好。但我試圖讓它看起來像一個普通的Windows計算器完全。我已經放下了代碼,並且有幾個問題。修改我的java swing計算器的圖形
- 如果您按等於兩次,您會發現文本上的數字將被設置爲零。有人能給我一個提示來解決這個問題嗎?
- 如果你按兩個連續函數(exe。add和multiply),你會發現它通常會做第一個函數。它應該按下第二個功能。再次,有人可以給我一個提示來解決這個問題嗎? Ggraphics:你如何調整按鈕大小?我試着調用buttons.resize(),它應該像在java API中一樣工作,但由於某種原因它沒有任何作用。
- 如何將按鈕上的文字設置爲不同的顏色?
順便說一句,我寧願如果有人第一次回答圖形問題,我肯定我可以自己計算出功能。
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import java.awt.GridBagConstraints;
import java.awt.Dimension;
public class Calculator extends JFrame implements ActionListener
{
JButton button1 = new JButton("1");
JButton button2 = new JButton("2");
JButton button3 = new JButton("3");
JButton button4 = new JButton("4");
JButton button5 = new JButton("5");
JButton button6 = new JButton("6");
JButton button7 = new JButton("7");
JButton button8 = new JButton("8");
JButton button9 = new JButton("9");
JButton button0 = new JButton("0");
JButton buttonAdd = new JButton("+");
JButton buttonSub = new JButton("-");
JButton buttonMult = new JButton("*");
JButton buttonDiv = new JButton("/");
JButton buttonEquals = new JButton("=");
JButton buttonClear = new JButton("C");
JButton plusOrMinus = new JButton("+/-");
JButton decimal = new JButton(".");
JButton squareRoot = new JButton("sqrt.");
JButton inverse = new JButton("1/x");
JButton mod = new JButton("%");
JButton backSpace = new JButton("Backspace");
JButton clearE = new JButton("CE");
JButton memoryClear = new JButton("MC");
JButton memoryRecall = new JButton("MR");
JButton memoryStore = new JButton("MS");
JButton memoryAdd = new JButton("M+");
JPanel jBack = new JPanel();
JLabel output = new JLabel("0");
JPanel jSpacing = new JPanel();
JPanel jMstr = new JPanel();
JPanel buttonSpace = new JPanel();
double firstNumber, memoryNumber;
String opera = "0";
boolean clear;
public Calculator()
{
output.setHorizontalTextPosition(JLabel.RIGHT);
output.setBackground(Color.WHITE);
output.setOpaque(true);
getContentPane().add(output, BorderLayout.NORTH);
jBack.setLayout(new GridLayout(1, 1, 2, 2));
jBack.add(backSpace);
jSpacing.setLayout(new GridLayout(1, 2, 2, 2));
jSpacing.add(clearE);
jSpacing.add(buttonClear);
buttonSpace.setLayout(new GridLayout(4, 5, 2, 2));
buttonSpace.add(memoryClear);
buttonSpace.add(button7);
buttonSpace.add(button8);
buttonSpace.add(button9);
buttonSpace.add(buttonDiv);
buttonSpace.add(squareRoot);
buttonSpace.add(memoryRecall);
buttonSpace.add(button4);
buttonSpace.add(button5);
buttonSpace.add(button6);
buttonSpace.add(buttonMult);
buttonSpace.add(inverse);
buttonSpace.add(memoryStore);
buttonSpace.add(button1);
buttonSpace.add(button2);
buttonSpace.add(button3);
buttonSpace.add(buttonSub);
buttonSpace.add(mod);
buttonSpace.add(memoryAdd);
buttonSpace.add(button0);
buttonSpace.add(plusOrMinus);
buttonSpace.add(decimal);
buttonSpace.add(buttonAdd);
buttonSpace.add(buttonEquals);
jMstr.setLayout(new BorderLayout());
jMstr.add(jBack, BorderLayout.WEST);
jMstr.add(jSpacing, BorderLayout.EAST);
jMstr.add(buttonSpace, BorderLayout.SOUTH);
getContentPane().add(jMstr, BorderLayout.SOUTH);
button1.addActionListener(this);
button2.addActionListener(this);
button3.addActionListener(this);
button4.addActionListener(this);
button5.addActionListener(this);
button6.addActionListener(this);
button7.addActionListener(this);
button8.addActionListener(this);
button9.addActionListener(this);
button0.addActionListener(this);
buttonAdd.addActionListener(this);
buttonSub.addActionListener(this);
buttonMult.addActionListener(this);
buttonDiv.addActionListener(this);
buttonEquals.addActionListener(this);
buttonClear.addActionListener(this);
plusOrMinus.addActionListener(this);
decimal.addActionListener(this);
squareRoot.addActionListener(this);
inverse.addActionListener(this);
mod.addActionListener(this);
backSpace.addActionListener(this);
clearE.addActionListener(this);
memoryClear.addActionListener(this);
memoryRecall.addActionListener(this);
memoryStore.addActionListener(this);
memoryAdd.addActionListener(this);
try
{
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
}
catch(Exception e)
{
}
SwingUtilities.updateComponentTreeUI(jMstr);
}
public void actionPerformed(ActionEvent e)
{
double result = 0;
if(e.getSource() == buttonEquals)
{
processEquals();
}
if(e.getSource() == button0)
{
putDigitOnLabel(0);
}
if(e.getSource() == button1)
{
putDigitOnLabel(1);
}
if(e.getSource() == button2)
{
putDigitOnLabel(2);
}
if(e.getSource() == button3)
{
putDigitOnLabel(3);
}
if(e.getSource() == button4)
{
putDigitOnLabel(4);
}
if(e.getSource() == button5)
{
putDigitOnLabel(5);
}
if(e.getSource() == button6)
{
putDigitOnLabel(6);
}
if(e.getSource() == button7)
{
putDigitOnLabel(7);
}
if(e.getSource() == button8)
{
putDigitOnLabel(8);
}
if(e.getSource() == button9)
{
putDigitOnLabel(9);
}
if(e.getSource() == plusOrMinus)
{
changeSign();
}
if(e.getSource() == decimal)
{
addDecimalPoint();
}
if(e.getSource() == buttonDiv)
{
if(getNumberInDisplay() == 0)
{
output.setText("Cannot divide a number by zero.");
}
operation("/");
}
if(e.getSource() == buttonMult)
{
operation("*");
}
if(e.getSource() == buttonSub)
{
operation("-");
}
if(e.getSource() == buttonAdd)
{
operation("+");
}
if(e.getSource() == squareRoot)
{
if(getNumberInDisplay() < 0)
{
output.setText("Cannot take the square root of a negative number.");
}
double num = Math.sqrt(Double.parseDouble(output.getText()));
output.setText(Double.toString(num));
}
if(e.getSource() == inverse)
{
if(getNumberInDisplay() == 0)
{
output.setText("Cannot take the inverse of the number zero");
}
double num = 1/(Double.parseDouble(output.getText()));
output.setText(Double.toString(num));
}
if(e.getSource() == mod)
{
result = getNumberInDisplay()/100;
displayResult(result);
}
if(e.getSource() == backSpace)
{
setTextOnOutput(getStringOnDisplay().substring(0, getStringOnDisplay().length()-1));
}
if(e.getSource() == clearE)
{
clearEverythingButOperation();
}
if(e.getSource() == buttonClear)
{
clearEverything();
}
if(e.getSource() == memoryRecall)
{
displayResult(memoryNumber);
}
if(e.getSource() == memoryStore)
{
memoryNumber = getNumberInDisplay();
}
if(e.getSource() == memoryAdd)
{
memoryNumber += getNumberInDisplay();
}
if(e.getSource() == memoryClear)
{
memoryNumber = 0;
}
}
public void setTextOnOutput(String s)
{
output.setText(s);
}
public String getStringOnDisplay()
{
return output.getText();
}
public void putDigitOnLabel(int digit)
{
if(clear == true)
{
output.setText("");
}
if(getStringOnDisplay().indexOf("0") == 0)
{
setTextOnOutput(getStringOnDisplay().substring(1));
}
output.setText(getStringOnDisplay() + digit);
clear = false;
}
public void addDecimalPoint()
{
if(clear == true)
{
setTextOnOutput("");
}
if(getStringOnDisplay().indexOf(".") == -1)
{
setTextOnOutput(new String(getStringOnDisplay() + "."));
}
}
public void changeSign()
{
if(Double.parseDouble(output.getText()) < 0)
{
setTextOnOutput(getStringOnDisplay().substring(1));
}
if(Double.parseDouble(output.getText()) > 0)
{
setTextOnOutput(Double.toString(getNumberInDisplay() * -1));
}
}
public void clearEverythingButOperation()
{
setTextOnOutput("0");
clear = true;
}
public void clearEverything()
{
setTextOnOutput("0");
opera = "0";
firstNumber = 0;
clear = true;
}
public double getNumberInDisplay()
{
String stuff = output.getText();
return Double.parseDouble(stuff);
}
public void operation(String s)
{
double number = getNumberInDisplay();
if(!(opera.equals("0")))
{
double result = processOperator();
displayResult(result);
firstNumber = result;
}
else
{
firstNumber = number;
}
clear = true;
opera = s;
}
public void processEquals()
{
double result;
result = processOperator();
displayResult(result);
opera = "0";
}
public double processOperator()
{
double answer = 0;
double number = getNumberInDisplay();
if(opera.equals("*"))
{
answer = firstNumber * number;
}
if(opera.equals("-"))
{
answer = firstNumber - number;
}
if(opera.equals("+"))
{
answer = firstNumber + number;
}
if(opera.equals("/"))
{
answer = firstNumber/number;
}
return answer;
}
public void displayResult(double result)
{
setTextOnOutput(Double.toString(result));
firstNumber = result;
clear = true;
}
public static void main(String args[])
{
Calculator f= new Calculator();
f.setTitle("Windows Calculator");
f.setSize(300, 300);
f.pack();
f.setVisible(true);
f.setResizable(false);
}
}
請仔細閱讀並使用數組。它會讓你的代碼大小的1/5,讓你和我們更容易閱讀,理解和調試。 –
如果你能弄清楚如何解決一些問題,你爲什麼要問這裏?開始調試以縮小出現問題的代碼。我們不是答案數據庫,我們幫助解決問題。 – Hidde