用Java编写.求两个数据之和(整数和小数) 2.判断两个数据是否相等(整数和小数) 3.获取两个数中较大的值(整数和小数) 4.获取两个数中较小的值(整数和小数) 5.否能用一个方法实现3和4的两个功能

1. 计算两个数据之和：

public class Main {
    public static void main(String[] args) {
        int a = 3;
        int b = 5;
        double c = 2.5;
        double d = 6.7;
        int sum1 = add(a, b);
        double sum2 = add(c, d);
        System.out.println("sum1 = " + sum1);
        System.out.println("sum2 = " + sum2);
    }

    public static int add(int a, int b) {
        return a + b;
    }

    public static double add(double a, double b) {
        return a + b;
    }
}

2. 判断两个数据是否相等：

public class Main {
    public static void main(String[] args) {
        int a = 3;
        int b = 5;
        double c = 2.5;
        double d = 6.7;
        boolean equal1 = isEqual(a, b);
        boolean equal2 = isEqual(c, d);
        System.out.println("equal1 = " + equal1);
        System.out.println("equal2 = " + equal2);
    }

    public static boolean isEqual(int a, int b) {
        return a == b;
    }

    public static boolean isEqual(double a, double b) {
        return a == b;
    }
}

3. 获取两个数中较大的值：

public class Main {
    public static void main(String[] args) {
        int a = 3;
        int b = 5;
        double c = 2.5;
        double d = 6.7;
        int max1 = getMax(a, b);
        double max2 = getMax(c, d);
        System.out.println("max1 = " + max1);
        System.out.println("max2 = " + max2);
    }

    public static int getMax(int a, int b) {
        return Math.max(a, b);
    }

    public static double getMax(double a, double b) {
        return Math.max(a, b);
    }
}

4. 获取两个数中较小的值：

public class Main {
    public static void main(String[] args) {
        int a = 3;
        int b = 5;
        double c = 2.5;
        double d = 6.7;
        int min1 = getMin(a, b);
        double min2 = getMin(c, d);
        System.out.println("min1 = " + min1);
        System.out.println("min2 = " + min2);
    }

    public static int getMin(int a, int b) {
        return Math.min(a, b);
    }

    public static double getMin(double a, double b) {
        return Math.min(a, b);
    }
}

5. 可以用一个方法实现3和4的两个功能，如下所示：

public class Main {
    public static void main(String[] args) {
        int a = 3;
        int b = 5;
        double c = 2.5;
        double d = 6.7;
        int max1 = getExtremeValue(a, b, true);
        double max2 = getExtremeValue(c, d, true);
        int min1 = getExtremeValue(a, b, false);
        double min2 = getExtremeValue(c, d, false);
        System.out.println("max1 = " + max1);
        System.out.println("max2 = " + max2);
        System.out.println("min1 = " + min1);
        System.out.println("min2 = " + min2);
    }

    public static <T extends Number> T getExtremeValue(T a, T b, boolean isMax) {
        if (isMax) {
            return a.doubleValue() > b.doubleValue() ? a : b;
        } else {
            return a.doubleValue() < b.doubleValue() ? a : b;
        }
    }
}

其中，`getExtremeValue` 方法使用了泛型，可以接受任何 Number 类型的参数，并根据第三个参数 `isMax` 来决定返回两个数中较大还是较小的值。