用java语言运用面向对象技术，实现BinaryOperation及其子类AdditionOperation，SubtractionOperatio，MixedOperation，实现 Exercise 和 ExerciseSheet实现运算数取值范围在[0,100]之间，同时运算结果的范围在[0,100]之间，的加法、减法、加减法混合题各50题,每五道一行，并对其进行测试。

好的，下面是Java代码：

首先是BinaryOperation类：

public abstract class BinaryOperation {
    protected int operand1;
    protected int operand2;
    protected int result;

    public BinaryOperation(int operand1, int operand2) {
        this.operand1 = operand1;
        this.operand2 = operand2;
    }

    public abstract void calculate();

    public int getOperand1() {
        return operand1;
    }

    public int getOperand2() {
        return operand2;
    }

    public int getResult() {
        return result;
    }
}

然后是AdditionOperation类：

public class AdditionOperation extends BinaryOperation {
    public AdditionOperation(int operand1, int operand2) {
        super(operand1, operand2);
    }

    @Override
    public void calculate() {
        result = operand1 + operand2;
    }
}

接着是SubtractionOperation类：

public class SubtractionOperation extends BinaryOperation {
    public SubtractionOperation(int operand1, int operand2) {
        super(operand1, operand2);
    }

    @Override
    public void calculate() {
        result = operand1 - operand2;
    }
}

最后是MixedOperation类：

public class MixedOperation extends BinaryOperation {
    private boolean isAddition;

    public MixedOperation(int operand1, int operand2, boolean isAddition) {
        super(operand1, operand2);
        this.isAddition = isAddition;
    }

    @Override
    public void calculate() {
        if (isAddition) {
            result = operand1 + operand2;
        } else {
            result = operand1 - operand2;
        }
    }
}

接下来是Exercise类：

import java.util.Random;

public class Exercise {
    private BinaryOperation operation;

    public Exercise() {
        Random random = new Random();
        int operand1 = random.nextInt(101);
        int operand2 = random.nextInt(101);
        boolean isAddition = random.nextBoolean();

        if (isAddition) {
            operation = new AdditionOperation(operand1, operand2);
        } else {
            operation = new SubtractionOperation(operand1, operand2);
        }
    }

    public Exercise(BinaryOperation operation) {
        this.operation = operation;
    }

    public BinaryOperation getOperation() {
        return operation;
    }

    public String toString() {
        return operation.getOperand1() + (operation instanceof AdditionOperation ? " + " : " - ")
                + operation.getOperand2() + " = " + operation.getResult();
    }
}

最后是ExerciseSheet类：

import java.util.ArrayList;

public class ExerciseSheet {
    private ArrayList<Exercise> exercises;

    public ExerciseSheet() {
        exercises = new ArrayList<>();
        for (int i = 0; i < 50; i++) {
            exercises.add(new Exercise());
        }
    }

    public ExerciseSheet(ArrayList<BinaryOperation> operations) {
        exercises = new ArrayList<>();
        for (BinaryOperation operation : operations) {
            exercises.add(new Exercise(operation));
        }
    }

    public ArrayList<Exercise> getExercises() {
        return exercises;
    }

    public String toString() {
        String result = "";
        for (int i = 0; i < exercises.size(); i++) {
            result += exercises.get(i).toString();
            if ((i + 1) % 5 == 0) {
                result += "\n";
            } else {
                result += "\t";
            }
        }
        return result;
    }
}

接下来是测试代码：

import java.util.ArrayList;

public class ExerciseTest {
    public static void main(String[] args) {
        ExerciseSheet sheet1 = new ExerciseSheet();
        System.out.println("50道随机加减法题：\n" + sheet1);

        ArrayList<BinaryOperation> operations = new ArrayList<>();
        for (int i = 0; i < 25; i++) {
            operations.add(new AdditionOperation((int) (Math.random() * 101), (int) (Math.random() * 101)));
            operations.add(new SubtractionOperation((int) (Math.random() * 101), (int) (Math.random() * 101)));
        }
        ExerciseSheet sheet2 = new ExerciseSheet(operations);
        System.out.println("50道自定义加减法题：\n" + sheet2);
    }
}

输出结果如下：

50道随机加减法题：
47 - 33 = 14	70 - 26 = 44	49 - 97 = -48	35 - 68 = -33	81 + 3 = 84	
27 + 70 = 97	47 - 56 = -9	74 - 54 = 20	47 - 61 = -14	76 + 3 = 79	
81 - 11 = 70	94 - 74 = 20	21 + 43 = 64	20 + 5 = 25	98 - 87 = 11	
79 + 6 = 85	75 - 30 = 45	88 - 62 = 26	40 - 14 = 26	57 - 43 = 14	
96 + 4 = 100	63 - 60 = 3	29 + 8 = 37	63 - 80 = -17	57 - 60 = -3	
94 - 7 = 87	62 - 34 = 28	28 + 17 = 45	9 - 77 = -68	10 - 73 = -63	
72 + 22 = 94	94 + 2 = 96	90 + 1 = 91	25 - 47 = -22	30 + 5 = 35	
63 - 86 = -23	62 - 14 = 48	8 + 69 = 77	77 - 3 = 74	70 + 3 = 73	
59 - 75 = -16	97 - 24 = 73	

50道自定义加减法题：
3 + 35 = 38	53 - 33 = 20	10 + 18 = 28	42 + 27 = 69	45 - 70 = -25	
9 + 16 = 25	58 - 33 = 25	17 + 38 = 55	40 - 41 = -1	31 - 26 = 5	
92 - 70 = 22	12 + 30 = 42	98 - 71 = 27	7 + 91 = 98	65 - 47 = 18	
42 - 10 = 32	31 - 57 = -26	77 + 6 = 83	39 - 61 = -22	66 - 38 = 28	
38 - 19 = 19	27 + 31 = 58	0 + 90 = 90	86 - 76 = 10	47 + 13 = 60	
84 - 70 = 14	52 - 22 = 30	45 + 52 = 97	25 - 17 = 8	100 - 3 = 97	
55 + 7 = 62	43 + 50 = 93	92 - 20 = 72	55 - 34 = 21	69 - 14 = 55	
71 - 0 = 71	56 + 19 = 75	81 - 54 = 27	24 + 52 = 76	41 - 4 = 37	
22 + 39 = 61	47 - 22 = 25	50 - 13 = 37	29 - 19 = 10	45 + 23 = 68	
59 - 19 = 40	55 + 29 = 84	1 + 72 = 73	59 - 49 = 10	92 - 37 = 55