package methods;

public class Demo01 {
    //main方法
    public static void main(String[] args) {
       double max=max(20.0,10.0);
       System.out.println(max);

    }
    //比大小
    public static int max(int num1,int num2){
        int result;
        if(num1>num2){
            result=num1;
        }
        
 
else{
            result=num2;
        }
       return result;
    }
    public static double max(double num1,double num2){
        double result;
        if(num1>num2){
            result=num1;
        }
        else{
            result=num2;
        }
        return result;
    }

}

可變引數

package
 
 methods;

public class Demo03 {
    public static void main(String[] args) {
    Demo03 demo03=new Demo03();
    demo03.test(1);

    }
    public static void test(int...i){
        System.out.println(i[0]);

    }
}

遞迴!!!

package methods;

public class Demo04 {
    public static void main(String[] args) {
        System.out.println(f(
 
3));

    }
    public static int f(int n){
        if(n==1){
            return 1;
        }
        else{
            return n*f(n-1);
        }
    }
}