基本数据类型与引用数据类型参数

package day05;

public class MethodDemo06 {
    /*方法参数传递为基本数据类型：传入方法中的是具体的数值*/
    public static void main(String[] args) {
        int number = 100;
        System.out.println("调用change方法前：" + number);
        number = 200;
        change(number);
        System.out.println("调用change方法后：" + number);

    }

    public static int change(int number) {
        return number;
    }
}

执行结果：

 方法参数为引用数据类型：

package day05;

public class MethodDemo07 {
    /*方法参数传递为引用类型：传入方法中的是内存地址*/
    public static void main(String[] args) {
        int[] arr = {12, 22, 40};
        System.out.println("调用change方法前：" + arr[1]);
        change(arr);
        System.out.println("调用change方法后：" + arr[1]);
    }

    public static void change(int[] arr) {
        arr[1] = 20;
    }
}

执行结果：

 eg:

package day05;

public class MethodDemo08 {
    public static void main(String[] args) {
        int[] arr = {1, 2, 3, 5, 34};
        int max = getMax(arr);
        System.out.println(max);
    }

    public static int getMax(int[] arr) {
        int max = arr[0];
        for (int i = 1; i < arr.length; i++) {
            if (max < arr[i]) {
                max = arr[i];
            }
        }
        return max;
    }
}

执行结果：

 eg:

package day05;

public class MethodDemo09 {
    public static void main(String[] args) {
        int[] arr = {23, 32, 11, 12};
        System.out.println("代码逻辑");
        printArray(arr);
        System.out.println();
    }

    public static void printArray(int[] arr) {
        System.out.print("[");
        for (int i = 0; i < arr.length; i++) {
            if (i == arr.length - 1) {
                System.out.print(arr[i] + "]");
            } else {
                System.out.print(arr[i] + ",");
            }
        }
    }
}

执行结果：

 eg：

package day05;

public class MethodDemo10 {
    public static void main(String[] args) {
        int[] arr = {11, 24, 13, 34, 25};
        int[] maxAndMin = getMaxAndMin(arr);
        System.out.println(maxAndMin[0]);
        System.out.println(maxAndMin[1]);
    }

    public static int[] getMaxAndMin(int[] arr) {
        int max = arr[0];
        for (int i = 1; i < arr.length; i++) {
            if (max < arr[i]) {
                max = arr[i];
            }
        }
        int min = arr[0];
        for (int i = 1; i < arr.length; i++) {
            if (min > arr[i]) {
                min = arr[i];
            }
        }
        int[] maxAndMin = {min, max};
        return maxAndMin;
    }
}

执行结果：