1. class Demo {
   
2. public static void main (String[] args) {
   
3. int a = 10,b = 20;
   
4. change(a, b);
   
5. System.out.println("a=" + a + ",b=" + b);
   
6. 
   
7. String s1 = "aaa";
   
8. String s2 = "bbb";
   
9. change(s1, s2);
   
10. System.out.println("s1=" + s1 + ",s2=" + s2);
    
11. 
    
12. int[] arr = {1, 2, 3, 4, 5};
    
13. change( arr );
    
14. System.out.println(arr[3]);
    
15. }
    
16. public static void change(int x, int y){
    
17. x = 100;
    
18. y = 200;
    
19. }
    
20. public static void change (String s1, String s2) {
    
21. s1 = "java";
    
22. s2 = "android";
    
23. }
    
24. public static void change(int[] arr) {
    
25. for (int i=0; i<arr.length; i++) {
    
26. arr[i] *= 2;
    
27. }
    
28. }
    
29. }

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1. class Demo {
   
2. public static void main (String[] args) {
   
3. int a = 10,b = 20;
   
4. change(a, b);
   
5. System.out.println("a=" + a + ",b=" + b);
   
6. 
   
7. String s1 = "aaa";
   
8. String s2 = "bbb";
   
9. change(s1, s2);
   
10. System.out.println("s1=" + s1 + ",s2=" + s2);
    
11. 
    
12. int[] arr = {1, 2, 3, 4, 5};
    
13. change( arr );
    
14. System.out.println(arr[3]);
    
15. }
    
16. public static void change(int x, int y){
    
17. x = 100;
    
18. y = 200;
    
19. }
    
20. public static void change (String s1, String s2) {
    
21. s1 = "java";
    
22. s2 = "android";
    
23. }
    
24. public static void change(int[] arr) {
    
25. for (int i=0; i<arr.length; i++) {
    
26. arr[i] *= 2;
    
27. }
    
28. }
    
29. }

复制代码