基本数据类型与引用数据类型参数

 1 package day05;
 2 
 3 public class MethodDemo06 {
 4     /*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*/
 5     public static void main(String[] args) {
 6         int number = 100;
 7         System.out.println("调用change方法前：" + number);
 8         number = 200;
 9         change(number);
10         System.out.println("调用change方法后：" + number);
11 
12     }
13 
14     public static int change(int number) {
15         return number;
16     }
17 }

执行结果：

方法参数为引用数据类型：

 1 package day05;
 2 
 3 public class MethodDemo07 {
 4     /*方法参数传递为引用类型：传入方法中的是内存地址*/
 5     public static void main(String[] args) {
 6         int[] arr = {12, 22, 40};
 7         System.out.println("调用change方法前：" + arr[1]);
 8         change(arr);
 9         System.out.println("调用change方法后：" + arr[1]);
10     }
11 
12     public static void change(int[] arr) {
13         arr[1] = 20;
14     }
15 }

执行结果：

eg:

 1 package day05;
 2 
 3 public class MethodDemo08 {
 4     public static void main(String[] args) {
 5         int[] arr = {1, 2, 3, 5, 34};
 6         int max = getMax(arr);
 7         System.out.println(max);
 8     }
 9 
10     public static int getMax(int[] arr) {
11         int max = arr[0];
12         for (int i = 1; i < arr.length; i++) {
13             if (max < arr[i]) {
14                 max = arr[i];
15             }
16         }
17         return max;
18     }
19 }

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：

 1 package day05;
 2 
 3 public class MethodDemo10 {
 4     public static void main(String[] args) {
 5         int[] arr = {11, 24, 13, 34, 25};
 6         int[] maxAndMin = getMaxAndMin(arr);
 7         System.out.println(maxAndMin[0]);
 8         System.out.println(maxAndMin[1]);
 9     }
10 
11     public static int[] getMaxAndMin(int[] arr) {
12         int max = arr[0];
13         for (int i = 1; i < arr.length; i++) {
14             if (max < arr[i]) {
15                 max = arr[i];
16             }
17         }
18         int min = arr[0];
19         for (int i = 1; i < arr.length; i++) {
20             if (min > arr[i]) {
21                 min = arr[i];
22             }
23         }
24         int[] maxAndMin = {min, max};
25         return maxAndMin;
26     }
27 }

执行结果：

欢迎批评指正，提出问题，谢谢！