作业5.1

结伴队友是12陈帝燊，博客地址:http://www.cnblogs.com/cds94/

这次有点赶，所以与之前的队友结对

主要代码：

import java.awt.*; 
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;

import javax.swing.*; 
public  class rrr extends JFrame implements ActionListener{
    JLabel L1=new JLabel("题目:");
    JLabel L2=new JLabel("输入题目个数:"); 
    JLabel L3=new JLabel("输入答案");
    JLabel L4=new JLabel("        "); 
    JLabel L5=new JLabel("        ");
    JTextField T1=new JTextField(6);
    JTextField T2=new JTextField(6);
    JButton B1=new JButton("开始");
    JButton B2=new JButton("重新开始");
    JButton B3=new JButton("下一题");
    JButton B4=new JButton("提交");
    JPanel p1=new JPanel();
    int n=0,ri,m=0,p;
    int a[]=new int[100];
    int b[]=new int[100];
    String c[]=new String[100];
    String ch[]={"+","-","*","/"};
    public static void main(String[] args) {
        new rrr();
        
        // TODO Auto-generated method stub
    }
    rrr()
    {
        
            this.setTitle("四则运算");
            this.setSize(300,350);
            this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
            this.add(p1); 
            p1.setLayout(null);
            L2.setBounds(50, 20, 90, 20);
            p1.add(L2);
            T2.setBounds(150, 20, 90, 30);
            p1.add(T2);
           L1.setBounds(50, 70, 90, 30);
            p1.add(L1);
            L4.setBounds(150, 70, 90, 30);
            p1.add(L4);
            L3.setBounds(50,120, 90, 30);
            p1.add(L3);
            T1.setBounds(150, 120, 90, 30);
            p1.add(T1);
            T1.setEnabled(false);
            B1.setBounds(50, 170, 90, 30);
            p1.add(B1);
            B1.addActionListener(this);
            B2.setBounds(150, 170, 90, 30);
            p1.add(B2);
            B2.setEnabled(false);
            B2.addActionListener(this);
            B3.setBounds(50,220,90,30);
            p1.add(B3);
            B3.setEnabled(false);
            B3.addActionListener(this);
            B4.setBounds(150, 220,90,30);
            p1.add(B4);
            B4.setEnabled(false);
            B4.addActionListener(this);
            L5.setBounds(50, 270, 180, 30);
            p1.add(L5);
            this.setVisible(true);
            this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//可以关闭窗体     
            B1.addActionListener(this);
    }
    public void actionPerformed(ActionEvent e){
        if(e.getSource()==B1){
            B1.setEnabled(false);
            B2.setEnabled(true);
            B3.setEnabled(true);
            B4.setEnabled(true);
            T2.setEnabled(false);
            T1.setEnabled(true);
            L5.setText(" ");
            m=0;
            ri=0;
            n=(int) Double.parseDouble(T2.getText());
            if(n>5||n<1)
            {
                JOptionPane.showMessageDialog(null,"输入的个数不能大于5或者小于1","注意",JOptionPane.INFORMATION_MESSAGE);
            }
            else begin();
            
        }
        if(e.getSource()==B2){
            B1.setEnabled(true);
            B2.setEnabled(false);
            B3.setEnabled(false);
            B4.setEnabled(false);
            T2.setEnabled(true);
            T1.setText("");
            T2.setText("");
        }
        if(e.getSource()==B3){
                begin();
                T1.setText("");
                B4.setEnabled(true);
                L5.setText(" ");
        }
        if(e.getSource()==B4){
            answer();
            B4.setEnabled(false);
            if(m==n){
                B2.setEnabled(true);
                B3.setEnabled(false);
                B4.setEnabled(false);
                T1.setEditable(false);
                JOptionPane.showMessageDialog(null,"答对了"+ri+"题，答错了"+(n-ri)+"题","成绩",JOptionPane.INFORMATION_MESSAGE);
            }
        }
    }
    void begin(){
        a[m]=(int)(Math.random()*200-100);
        b[m]=(int)(Math.random()*200-100);
        c[m]=ch[(int)(Math.random()*3)];
        while(b[m]==0&&c[m]==ch[3]){
            b[m]=(int)(Math.random()*200-100);
        }
        if(a[m]>=0&&b[m]>=0){
        L4.setText(String.valueOf(a[m])+c[m]+String.valueOf(b[m])+"=");
        }
        if(a[m]<0&&b[m]>=0){
            L4.setText("("+String.valueOf(a[m])+")"+c[m]+String.valueOf(b[m])+"=");
            }
        if(a[m]>=0&&b[m]<0){
            L4.setText(String.valueOf(a[m])+c[m]+"("+String.valueOf(b[m])+")"+"=");
            }
        if(a[m]<0&&b[m]<0){
            L4.setText("("+String.valueOf(a[m])+")"+c[m]+"("+String.valueOf(b[m])+")"+"=");
            }
    }
    void answer(){
        calc re=new calc();
        double an=Double.parseDouble(T1.getText());
        if(re.cal(a[m], b[m], c[m])==an){
            L5.setText("答案正确！");
            ri++;
        }
        else{
            L5.setText("答案错误！正确答案是"+re.cal(a[m], b[m], c[m]));
        }
        m++;
    }
}

计算功能的算法封装成的类：

public class cal {
    int calc(int a,int b,String c){
        int d = 0;
        if(c.equals("+")) d=add(a,b);
        if(c.equals("-")) d=minius(a,b);
        if(c.equals("*")) d=mult(a,b);
        if(c.equals("/")) d=divi(a,b);
        return d;
    }
    int add(int a,int b){
        return a+b;
    } 
    int minius(int a,int b){
        return a-b;
    }
    int mult(int a,int b){
        return a*b;
    }
    int divi(int a,int b){
        return a/b;
    }

}

 单元测试：

import static org.junit.Assert.*;

import org.junit.Test;

public class calTest {
    cal test=new cal();
    @Test
    public void testCal() {
        assertEquals(-4,test.cal(-12, 3,"/"));
    }
    @Test
    public void testCal2() {
        assertEquals(-9,test.cal(-12, 3,"+"));
    }
    @Test
    public void testCal3() {
        assertEquals(-15,test.cal(-12, 3,"-"));
    }
    @Test
    public void testCal4() {
        assertEquals(-36,test.cal(-12, 3,"*"));
    }
    @Test
    public void testAdd() {
        assertEquals(9,test.add(3, 6));
    }

    @Test
    public void testMinius() {
        assertEquals(-6,test.minius(3, 9));
    }

    @Test
    public void testMult() {
        assertEquals(-27,test.mult(-3, 9));
    }

    @Test
    public void testDivi() {
        assertEquals(5,test.divi(25, 5));
    }

}

测试结果： 

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原文地址：https://www.cnblogs.com/poipoi/p/4469075.html