java第四天

今天才是脑壳都扣烂了。

什么没教就各种做、 不过这样有好处的；锻炼思维。

今天还是一个在简单的计算器的基础上实现运算与字符串的链接

补昨天的代码：import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JTextField;

import javax.xml.ws.Dispatch;

public class Calculator {

static String container1="";

static String container2="";

static String op="";

static String container="";

public static void main(String[]args){

JFrame Calculator=new JFrame("计算器");

Calculator.setBounds(800, 350, 350, 420);

Calculator.setLayout(null);

Calculator.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

JTextField display=new JTextField("");

display.setBounds(20, 30, 300, 80);

JButton buttonmc=new JButton("mc");

buttonmc.setBounds(20, 120, 55, 30);

buttonmc.addActionListener(new ActionListener() {

//buttonmc监听器              产生一个新的监听器

@Override

public void actionPerformed(ActionEvent e) {

//监听器入口    ActionEven（按键）方法

String buttonValue= buttonmc.getText();

//获取按钮的值

String newValue=display.getText()+buttonValue;

//获取框中的值

//display.getText() + buttonValue;

display.setText(newValue);

//display.setText(buttonValue+display.getText());

//将获取文本的值（buttonValue）放在  display 窗口中

}

});

JButton buttonmr=new JButton("mr");

buttonmr.setBounds(80, 120, 55, 30);

buttonmr.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

String buttonValue=buttonmr.getText();

String newValue= display.getText()+buttonValue;

display.setText(newValue);

}

});

JButton buttonms=new JButton("ms");

buttonms.setBounds(140, 120, 55, 30);

JButton buttonmplus=new JButton("m+");

buttonmplus.setBounds(200, 120, 55, 30);

JButton buttonreduce=new JButton("m-");

buttonreduce.setBounds(260, 120, 55, 30);

JButton buttonback=new JButton("←");

buttonback.setBounds(20, 160, 55, 30);

JButton buttonce=new JButton("ce");

buttonce.setBounds(80, 160, 55, 30);

JButton buttonc=new JButton("c");

buttonc.setBounds(140, 160, 55, 30);

JButton buttonpr=new JButton("±");

buttonpr.setBounds(200, 160, 55, 30);

JButton buttonreagan=new JButton("√");

buttonreagan.setBounds(260, 160, 55, 30);

JButton button7=new JButton("7");

button7.setBounds(20, 200, 55, 30);

button7.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

String buttonValue=button7.getText();

container=container+buttonValue;

display.setText(container);

}

});

JButton button8=new JButton("8");

button8.setBounds(80, 200, 55, 30);

button8.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

String buttonValue=button8.getText();

display.setText(display.getText()+buttonValue);

}

});

JButton button9=new JButton("9");

button9.setBounds(140, 200, 55, 30);

button9.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

String buttonValue=button9.getText();

display.setText(display.getText()+buttonValue);

}

});

JButton buttonsemicolon=new JButton("/");

buttonsemicolon.setBounds(200, 200, 55, 30);

JButton buttonsign=new JButton("%");

buttonsign.setBounds(260, 200, 55, 30);

JButton button4=new JButton("4");

button4.setBounds(20, 240, 55, 30);

button4.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

String buttonValue=button4.getText();

display.setText(display.getText()+buttonValue);

}

});

JButton button5=new JButton("5");

button5.setBounds(80, 240, 55, 30);

button5.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

String buttonValue=button5.getText();

display.setText(display.getText()+buttonValue);

}

});

JButton button6=new JButton("6");

button6.setBounds(140, 240, 55, 30);

button6.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

String buttonValue=button6.getText();

display.setText(display.getText()+buttonValue);

}

});

JButton buttonride=new JButton("*");

buttonride.setBounds(200, 240, 55, 30);

JButton buttonone=new JButton("1/x");

buttonone.setBounds(260, 240, 55, 30);

JButton button1=new JButton("1");

button1.setBounds(20, 280, 55, 30);

button1.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

String buttonValue=button1.getText();

display.setText(display.getText()+buttonValue);

}

});

JButton button2=new JButton("2");

button2.setBounds(80, 280, 55, 30);

button2.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

String buttonValue=button2.getText();

display.setText(display.getText()+buttonValue);

}

});

JButton button3=new JButton("3");

button3.setBounds(140, 280, 55, 30);

button3.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

String buttonValue=button3.getText();

display.setText(display.getText()+buttonValue);

}

});

JButton buttontwo=new JButton("-");

buttontwo.setBounds(200, 280, 55, 30);

JButton buttonthree=new JButton("=");

buttonthree.setBounds(260, 280, 55, 70);

buttonthree.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

container2=container;

container="";

int c1=Integer.parseInt(container1);

int c2=Integer.parseInt(container2);

int c = 0;

if(op == "+"){

c = c1 + c2;

}else if(op == "-"){

c = c1 - c2;

}

String result=c+"";

display.setText(result);

}

});

JButton button0=new JButton("0");

button0.setBounds(20, 320, 110, 30);

button0.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

String button0value=button0.getText();

display.setText(display.getText()+button0value);

}

});

JButton buttonspot=new JButton(".");

buttonspot.setBounds(140, 320, 55, 30);

JButton buttonplus=new JButton("+");

buttonplus.setBounds(200, 320, 55, 30);

buttonplus.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

container1=container;

String buttonValue=buttonplus.getText();

op=buttonValue;

container="";

}

});

Calculator.add(button0);

Calculator.add(buttonspot);

Calculator.add(buttonplus);

Calculator.add(button1);

Calculator.add(button2);

Calculator.add(button3);

Calculator.add(buttontwo);

Calculator.add(buttonthree);

Calculator.add(buttonone);

Calculator.add(buttonride);

Calculator.add(button6);

Calculator.add(button5);

Calculator.add(button4);

Calculator.add(buttonsign);

Calculator.add(buttonsemicolon);

Calculator.add(button9);

Calculator.add(button8);

Calculator.add(button7);

Calculator.add(buttonc);

Calculator.add(buttonreagan);

Calculator.add(buttonpr);

Calculator.add(buttonce);

Calculator.add(buttonback);

Calculator.add(buttonreduce);

Calculator.add(buttonmplus);

Calculator.add(buttonms);

Calculator.add(buttonmr);

Calculator.add(buttonmc);

Calculator.add(display);

Calculator.setVisible(true);

}

}

以上代码是我复制过来的。自己做的；虽然没有做完。现在就是实现了字符串的连接。没有实现加法运算。对了，没有讲if所以只是大概的了解了些。并不是全懂。

我想问的是这个会不会跟我的顺寻有关，从而没实现加法运算。晚上或者明天我会试一试把123这些数字放在最上面。然后我想请问大神们如果真的是因为顺序的原因，能有什么解决的方法吗？

做出这个程序要思考我要给他多少个框架。然后如何实现这个框架，让他显示出来。要设置什么样的常量好引用。

actionlistener——监听器

actionEven——按键

Integer.parseInt——字符创的转换

int——整数类型的

String——字符串类型

不同的类型要用不同的类型才能进行运算。

做这个大概用到的知识有：界面、监听、设置、获取、转换、判断、添加、显示。

经过了解不是顺序的问题。是我那个地方出错了。等我三天做完在来看一下是什么问题。

import java.awt.event.ActionEvent;import java.awt.event.ActionListener;
import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JTextField;import javax.xml.ws.Dispatch;

public class Calculator {static String container1="";static String container2="";static String op="";static String container="";public static void main(String[]args){JFrame Calculator=new JFrame("计算器");Calculator.setBounds(800, 350, 350, 420);Calculator.setLayout(null);Calculator.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);JTextField display=new JTextField("");display.setBounds(20, 30, 300, 80);JButton buttonmc=new JButton("mc");buttonmc.setBounds(20, 120, 55, 30);buttonmc.addActionListener(new ActionListener() {//buttonmc监听器              产生一个新的监听器@Overridepublic void actionPerformed(ActionEvent e) {//监听器入口    ActionEven（按键）方法String buttonValue= buttonmc.getText();//获取按钮的值String newValue=display.getText()+buttonValue;//获取框中的值//display.getText() + buttonValue;display.setText(newValue);//display.setText(buttonValue+display.getText());//将获取文本的值（buttonValue）放在  display 窗口中}});JButton buttonmr=new JButton("mr");buttonmr.setBounds(80, 120, 55, 30);buttonmr.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {String buttonValue=buttonmr.getText();String newValue= display.getText()+buttonValue;display.setText(newValue);}});JButton buttonms=new JButton("ms");buttonms.setBounds(140, 120, 55, 30);JButton buttonmplus=new JButton("m+");buttonmplus.setBounds(200, 120, 55, 30);JButton buttonreduce=new JButton("m-");buttonreduce.setBounds(260, 120, 55, 30);JButton buttonback=new JButton("←");buttonback.setBounds(20, 160, 55, 30);JButton buttonce=new JButton("ce");buttonce.setBounds(80, 160, 55, 30);JButton buttonc=new JButton("c");buttonc.setBounds(140, 160, 55, 30);JButton buttonpr=new JButton("±");buttonpr.setBounds(200, 160, 55, 30);JButton buttonreagan=new JButton("√");buttonreagan.setBounds(260, 160, 55, 30);JButton button7=new JButton("7");button7.setBounds(20, 200, 55, 30);button7.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {String buttonValue=button7.getText();container=container+buttonValue;display.setText(container);}});JButton button8=new JButton("8");button8.setBounds(80, 200, 55, 30);button8.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {String buttonValue=button8.getText();display.setText(display.getText()+buttonValue);}});JButton button9=new JButton("9");button9.setBounds(140, 200, 55, 30);button9.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {String buttonValue=button9.getText();display.setText(display.getText()+buttonValue);}});JButton buttonsemicolon=new JButton("/");buttonsemicolon.setBounds(200, 200, 55, 30);JButton buttonsign=new JButton("%");buttonsign.setBounds(260, 200, 55, 30);JButton button4=new JButton("4");button4.setBounds(20, 240, 55, 30);button4.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {String buttonValue=button4.getText();display.setText(display.getText()+buttonValue);}});JButton button5=new JButton("5");button5.setBounds(80, 240, 55, 30);button5.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {String buttonValue=button5.getText();display.setText(display.getText()+buttonValue);}});JButton button6=new JButton("6");button6.setBounds(140, 240, 55, 30);button6.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {String buttonValue=button6.getText();display.setText(display.getText()+buttonValue);}});JButton buttonride=new JButton("*");buttonride.setBounds(200, 240, 55, 30);JButton buttonone=new JButton("1/x");buttonone.setBounds(260, 240, 55, 30);JButton button1=new JButton("1");button1.setBounds(20, 280, 55, 30);button1.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {String buttonValue=button1.getText();display.setText(display.getText()+buttonValue);}});JButton button2=new JButton("2");button2.setBounds(80, 280, 55, 30);button2.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {String buttonValue=button2.getText();display.setText(display.getText()+buttonValue);}});JButton button3=new JButton("3");button3.setBounds(140, 280, 55, 30);button3.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {String buttonValue=button3.getText();display.setText(display.getText()+buttonValue);}});JButton buttontwo=new JButton("-");buttontwo.setBounds(200, 280, 55, 30);JButton buttonthree=new JButton("=");buttonthree.setBounds(260, 280, 55, 70);buttonthree.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {container2=container;container="";int c1=Integer.parseInt(container1);int c2=Integer.parseInt(container2);int c = 0;if(op == "+"){c = c1 + c2;}else if(op == "-"){c = c1 - c2;}String result=c+"";display.setText(result);}});JButton button0=new JButton("0");button0.setBounds(20, 320, 110, 30);button0.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {String button0value=button0.getText();display.setText(display.getText()+button0value);}});JButton buttonspot=new JButton(".");buttonspot.setBounds(140, 320, 55, 30);JButton buttonplus=new JButton("+");buttonplus.setBounds(200, 320, 55, 30);buttonplus.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {container1=container;String buttonValue=buttonplus.getText();op=buttonValue;container="";}});
Calculator.add(button0);Calculator.add(buttonspot);Calculator.add(buttonplus);Calculator.add(button1);Calculator.add(button2);Calculator.add(button3);Calculator.add(buttontwo);Calculator.add(buttonthree);Calculator.add(buttonone);Calculator.add(buttonride);Calculator.add(button6);Calculator.add(button5);Calculator.add(button4);Calculator.add(buttonsign);Calculator.add(buttonsemicolon);Calculator.add(button9);Calculator.add(button8);Calculator.add(button7);Calculator.add(buttonc);Calculator.add(buttonreagan);Calculator.add(buttonpr);Calculator.add(buttonce);Calculator.add(buttonback);Calculator.add(buttonreduce);Calculator.add(buttonmplus);Calculator.add(buttonms);Calculator.add(buttonmr);Calculator.add(buttonmc);Calculator.add(display);Calculator.setVisible(true);}
}