簡易計算器(java實現(xiàn)).doc

/此計算器能夠進行簡單的加減乘除運算，界面如下：package 計算器;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JTextArea;class Calc implements ActionListenerJFrame frame=new JFrame(計算器);JPanel pan=new JPanel(new GridLayout(4,4,20,30);JTextArea xianshi=new JTextArea(1,20);JLabel lab1=new JLabel(結(jié)果：);JButton number=new JButton10;JButton plus=new JButton(+);JButton reduce=new JButton(-);JButton multi=new JButton(*);JButton divide=new JButton(/);JButton point=new JButton(.);JButton equals=new JButton(=);JButton reset=new JButton(重置);float num1=0,num2=0;boolean flag=false;int t=0;int temp=0;/temp記錄每次按下鍵的類型public void jisuan()for(int i=0;i=9;i+)numberi=new JButton(Integer.toString(i);pan.add(numberi);numberi.addActionListener(this);pan.add(point);pan.add(equals);pan.add(plus);pan.add(reduce);pan.add(multi);pan.add(divide);lab1.setBounds(30, 10, 80, 20);xianshi.setBounds(100, 10, 200, 20);reset.setBounds(310, 10, 60, 30);pan.setBounds(10, 50, 360, 360);this.frame.setLayout(null);this.frame.add(xianshi);this.frame.add(pan);this.frame.add(lab1);this.frame.add(reset);this.frame.setBounds(400, 200, 400, 500);this.frame.setVisible(true);xianshi.setEditable(false);xianshi.setText(0);point.addActionListener(this);equals.addActionListener(this);plus.addActionListener(this);reduce.addActionListener(this);multi.addActionListener(this);divide.addActionListener(this);reset.addActionListener(new ActionListener()Overridepublic void actionPerformed(ActionEvent arg0) xianshi.setText(0);num1=num2=0;t=0;flag=false;);Overridepublic void actionPerformed(ActionEvent arg0) String n=xianshi.getText();for(int i=0;i=9;i+)if(arg0.getSource()=numberi)if(xianshi.getText().equals(0)&xianshi.getText().length()=1)|temp=3)xianshi.setText(Integer.toString(i);elsexianshi.append(Integer.toString(i);flag=true;temp=1;/1表示按下數(shù)字鍵if(!flag)/非數(shù)字鍵觸發(fā)事件if(arg0.getSource()=point)if(xianshi.getText().matches(-?d+)|xianshi.getText().matches(-?d+(.+d+)?+-*/d*)/對應(yīng)num1,num2中小數(shù)xianshi.append(.);else if(arg0.getSource()!=equals)/鍵入運算符if(!n.matches(-?d+(.d+)?+-*/)trynum1=Float.parseFloat(xianshi.getText();catch(Exception e)if(arg0.getSource()=plus)t=1;xianshi.append(+);else if(arg0.getSource()=reduce)if(xianshi.getText().equals(0)|temp=3)xianshi.setText(-);/負號的顯示elset=2;xianshi.append(-);/減號else if(arg0.getSource()=multi)t=3;xianshi.append(*);else if(arg0.getSource()=divide)t=4;xianshi.append(/);temp=2;/表示按下運算符鍵else /鍵入等于String tmp=xianshi.getText();int first=0;if(t=1)first=tmp.indexOf(+);num2=this.updatenum2(tmp, first);xianshi.setText(Float.toString(num1+num2);else if(t=2)first=tmp.lastIndexOf(-);num2=this.updatenum2(tmp, first);xianshi.setText(Float.toString(num1-num2);else if(t=3)first=tmp.indexOf(*);num2=this.updatenum2(tmp, first);xianshi.setText(Float.toString(num1*num2);else if(t=4)first=tmp.indexOf(/);num2=this.updatenum2(tmp, first);xianshi.setText(Float.toString(num1/num2);num1=num2=Float.parseFloat(xianshi.getText();temp=3;/按下等于鍵t=0;flag=false;public float updatenum2(String tmp,int first)if(first=t