简单四则运算（PSP）

  1 import java.util.ArrayList;
  2 import java.util.List;
  3 import java.util.Random;
  4 import java.util.Scanner;
  5 import java.util.function.BiFunction;
  6 public class FourArithmetic {
  7     private List<Subject> subjectList;
  8     public List<Subject> getSubjectList() {
  9         return subjectList;
 10     }
 11     public void setSubjectList(List<Subject> subjectList) {
 12         this.subjectList = subjectList;
 13     }
 14     public FourArithmetic() {
 15         System.out.print("输入题目数量\n");
 16         Scanner count = new Scanner(System.in);
 17         int c = count.nextInt();
 18         List<Subject> list = new ArrayList<Subject>();
 19         BiFunction<Integer, Integer, Integer> sum = (x, y) -> x + y;
 20         BiFunction<Integer, Integer, Integer> minus = (x, y) -> x - y;
 21         BiFunction<Integer, Integer, Integer> multiple = (x, y) -> x * y;
 22         BiFunction<Integer, Integer, Integer> divide = (x, y) -> x / y;
 23         for (int i = 0; i < c; i++) { //题目数量
 24             Subject subject = new Subject();
 25             Integer a = new Random().nextInt(99);
 26             Integer b = new Random().nextInt(99);
 27             Float a1 = new Random().nextFloat();
 28             Float b1 = new Random().nextFloat();
 29             subject.setA(a);
 30             subject.setB(b);
 31             subject.setA1(a1);
 32             subject.setB1(b1);
 33             subject.setIndex(i + 1);
 34             Integer symbol = new Random().nextInt(4);//控制加减乘除出现
 35             if (symbol == 0) {
 36                 subject.setSymbol("+");
 37                 subject.setAnswer(sum.apply(a, b));
 38             } else if (symbol == 1) {
 39                 subject.setSymbol("-");
 40                 subject.setAnswer(minus.apply(a, b));
 41             } else if (symbol == 2) {
 42                 subject.setSymbol("×");
 43                 subject.setAnswer(multiple.apply(a, b));
 44             } else if (symbol == 3) {
 45                 subject.setSymbol("÷");
 46                 subject.setAnswer(divide.apply(a, b));
 47             }
 48             list.add(subject);
 49         }
 50         this.subjectList = list;
 51     }
 52 
 53     public static void main(String[] args) {
 54         FourArithmetic f = new FourArithmetic();
 55         System.out.println("四则运算：");
 56         f.getSubjectList().forEach(subject -> {
 57             System.out.println("(" + subject.getIndex() + ") " + subject.getA() + subject.getSymbol()+subject.getB() + "= ?");
 58         });
 59         System.out.print("*******答案*******\n");
 60         f.getSubjectList().forEach(subject -> {
 61             System.out.println("第" + subject.getIndex() + "题：" + subject.getAnswer());
 62         });
 63     }
 64 }
 65 class Subject {
 66     private Integer index;
 67     private Integer a;
 68     private Integer b;
 69     private String symbol;
 70     private Integer answer;
 71     private Float a1;
 72     private Float b1;
 73     public Integer getIndex() {
 74         return index;
 75     }
 76     public void setIndex(Integer index) {
 77         this.index = index;
 78     }
 79     public Integer getA() {
 80         return a;
 81     }
 82     public void setA(Integer a) {
 83         this.a = a;
 84     }
 85     public Integer getB() {
 86         return b;
 87     }
 88     public void setB(Integer b) {
 89         this.b = b;
 90     }
 91     public void setB1(Float b1) {
 92         this.b1 = b1;
 93     }
 94     public Float getB1() {
 95         return b1;
 96     }
 97     public void setA1(Float a1) {
 98         this.a1 = a1;
 99     }
100     public Float getA1() {
101         return a1;
102     }
103     public String getSymbol() {
104         return symbol;
105     }
106     public void setSymbol(String symbol) {
107         this.symbol = symbol;
108     }
109     public Integer getAnswer() {
110         return answer;
111     }
112     public void setAnswer(Integer answer) {
113         this.answer = answer;
114     }
115 }