1636050123 邓艳丽

1.
public class Test{
public static void main(String[] args){
int i;
for(i=1;i<=5;i++){
System.out.println("Welcome to java"); 
}
}

2.

public class AverageSpeed{

public static void main(String[]args){

double speedkm =60/(45.5/14);

double speedm = speedkm /1.6;

system.out.println（“averagespeed = ”+speedm + "m/h"）

}

}

3.

public class Circle{private double r;public  Circle(double r){this.r =r;}public  double getLength(){return 2*Math.PI*r;}public  double getArea(){return Math.PI*r*r;}}