例4.1在主函式中呼叫其他函式

 1 public class cjava {
 2     public static void main(String[] args) {
 3         printstar();
 4         print_message();
 5         printstar();
 6     }
 7     static void printstar() {
 8         System.out.println("*************************************");
 9     }
10     static
 
 void print_message() {
11         System.out.println("Weclome to java!!!");
12     }
13 }

例4.2呼叫函式時的資料傳遞

 1 import java.util.Scanner;
 2 public class cjava {
 3     public static void main(String[] args) {
 4         int a,b,c;
 5         System.out.println("please enter two integer number:");
 
 6         Scanner s=new Scanner(System.in);
 7         a=s.nextInt();
 8         b=s.nextInt();
 9         c=max(a,b);
10         System.out.println("max="+c);
11     }
12     static int max(int x,int y) {
13         int z;
14         z=x>y?x:y;
15         return z;
16     }
17 }
18     

例4.3對被呼叫的函式宣告

 1 import java.util.Scanner;
 2 public class cjava {
 3     public static void main(String[] args) {
 4         float a,b,c;
 5         System.out.println("please enter a,b:");
 6         Scanner s=new Scanner(System.in);
 7         a=s.nextFloat();
 8         b=s.nextFloat();
 9         c=add(a,b);
10         System.out.println("max="+c);
11     }
12     static float add(float x,float y) {
13         float z;
14         z=x+y;
15         return z;
16     }
17 }

2.遇到的問題：沒有問題

3.明天繼續學習