Question

怎么在主函数里调用后面的函数?JAVA

mport java.util.Scanner;
public class CH06_01 {
public static void main(String[]args){
Scanner input=new Scanner(System.in);
System.out.println("please enter the first number");
int a =input.nextInt();
System.out.println("please enter the second number");
int b =input.nextInt();
System.out.println("最大公约数为"+b);
}
int gcd(int a,int b){
int r=a%b;
while(r!=0){
a=b;
b=r;
r=a%b;}
return b

Answer 1

import java.util.Scanner;
public class CH06_01 {
public static void main(String[]args){
Scanner input=new Scanner(System.in);
System.out.println("please enter the first number");
int a =input.nextInt();
System.out.println("please enter the second number");
int b =input.nextInt();
System.out.println("最大公约数为"+b);
System.out.println(gcd(a,b));
}
public static int gcd(int a,int b){
int r=a%b;
while(r!=0){
a=b;
b=r;
r=a%b;
}
return b;
}
}

注意编写代码的格式，如果在同一个类中在主函数里调用方法，方法必须为static修饰，原因很简单，main方法为类方法，类方法只能调用类变量和类方法。如果是多个类就创建对象，然后通过对象来调用就行…………

Answer 2

你只需要使用类名.方法名就可以了
public static void main(String[]args){

CH06_01 ch=new CH06_01();

Scanner input=new Scanner(System.in);
System.out.println("please enter the first number");
int a =input.nextInt();
System.out.println("please enter the second number");
int b =input.nextInt();

ch.gcd(a,b);

System.out.println("最大公约数为"+b);
}

Answer 3

一下是源代码：（注意楼主，主函数中不鞥用a，b，这里用m，n代替）
import java.util.Scanner;
public class CH06_01 {
public static void main(String[]args){
Scanner input=new Scanner(System.in);
System.out.println("please enter the first number");
int m =input.nextInt();
System.out.println("please enter the second number");
int n =input.nextInt();
System.out.println("最大公约数为"+b);
CH06_01 p=new CH06_01();
p.gcd(m,n);
}
int gcd(int a,int b){
int r=a%b;
while(r!=0){
a=b;
b=r;
r=a%b;}
return b;
}