简单四则运算（PSP）

任务要求：
　　小学生简单四则运算题库

运行软件：
　　 Eclipse  

程序功能：
　　能够输出100以内整数的四则运算题目，并且打印相应答案。

代码：

import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.Scanner;
import java.util.function.BiFunction;
public class FourArithmetic {
	private List<Subject> subjectList;
	public List<Subject> getSubjectList() {
		return subjectList;
	}
	public void setSubjectList(List<Subject> subjectList) {
		this.subjectList = subjectList;
	}
	public FourArithmetic() {
		System.out.print("输入题目数量\n");
		Scanner count = new Scanner(System.in);
		int c = count.nextInt();
		List<Subject> list = new ArrayList<Subject>();
		BiFunction<Integer, Integer, Integer> sum = (x, y) -> x + y;
		BiFunction<Integer, Integer, Integer> minus = (x, y) -> x - y;
		BiFunction<Integer, Integer, Integer> multiple = (x, y) -> x * y;
		BiFunction<Integer, Integer, Integer> divide = (x, y) -> x / y;
		for (int i = 0; i < c; i++) { //题目数量
			Subject subject = new Subject();
			Integer a = new Random().nextInt(99);
			Integer b = new Random().nextInt(99);
			Float a1 = new Random().nextFloat();
			Float b1 = new Random().nextFloat();
			subject.setA(a);
			subject.setB(b);
			subject.setA1(a1);
			subject.setB1(b1);
			subject.setIndex(i + 1);
			Integer symbol = new Random().nextInt(4);
			if (symbol == 0) {
				subject.setSymbol("+");
				subject.setAnswer(sum.apply(a, b));
			} else if (symbol == 1) {
				subject.setSymbol("-");
				subject.setAnswer(minus.apply(a, b));
			} else if (symbol == 2) {
				subject.setSymbol("×");
				subject.setAnswer(multiple.apply(a, b));
			} else if (symbol == 3) {
				subject.setSymbol("÷");
				subject.setAnswer(divide.apply(a, b));
			}
			list.add(subject);
		}
		this.subjectList = list;
	}

	public static void main(String[] args) {
		FourArithmetic f = new FourArithmetic();
		System.out.println("整数四则运算（除法保留整数位）：");
		f.getSubjectList().forEach(subject -> {
			System.out.println("(" + subject.getIndex() + ") " + subject.getA() + subject.getSymbol()+subject.getB() + "= ?");
		});
		System.out.print("*******答案*******\n");
        f.getSubjectList().forEach(subject -> {
    		System.out.println("第" + subject.getIndex() + "题：" + subject.getAnswer());
    	});
	}
}
class Subject {
	private Integer index;
	private Integer a;
	private Integer b;
	private String symbol;
	private Integer answer;
	private Float a1;
	private Float b1;
	public Integer getIndex() {
		return index;
	}
	public void setIndex(Integer index) {
		this.index = index;
	}
	public Integer getA() {
		return a;
	}
	public void setA(Integer a) {
		this.a = a;
	}
	public Integer getB() {
		return b;
	}
	public void setB(Integer b) {
		this.b = b;
	}
	public void setB1(Float b1) {
		this.b1 = b1;
	}
	public Float getB1() {
		return b1;
	}
	public void setA1(Float a1) {
		this.a1 = a1;
	}
	public Float getA1() {
		return a1;
	}
	public String getSymbol() {
		return symbol;
	}
	public void setSymbol(String symbol) {
		this.symbol = symbol;
	}
	public Integer getAnswer() {
		return answer;
	}
	public void setAnswer(Integer answer) {
		this.answer = answer;
	}
}

　　运行结果：

 

psp2.1流程图

PSP2.1	Personal Software Process Stages	预估耗时（分钟）	实际耗时（分钟）
Planning	计划	20	20
Estimate	估计这个任务需要多少时间	100	100
Development	开发	100	90
Analysis	需求分析	10	10
Design Spec	生成设计文档	/	/
Design Review	设计复审 (和同事审核设计文档)	/	/
Coding Standard	代码规范 (为目前的开发制定合适的规范	/	/
Design	具体设计	10	10
Coding	具体编码	150	150
Code Review	代码复审	60	60
Test	测试（自我测试，修改代码，提交修改）	80	80
Reporting	报告	5	5
Test Report	测试报告	5	5
Size Measurement	计算工作量	5	5
Postmortem& Process Improvement Plan	事后总结, 并提出过程改进计划	10	10
合计		555	545