public class Flower {
 private String string;
 private int age;

 public Flower() {
  // 先调用public Flower(String string, int age)
  this("leon", 120);
  // 先调用public Flower(String string, int age)
 }
 public Flower(String string) {
  this(string, 12);
 }

 public Flower(String string, int age) {
  this.string = string;
  this.age = age;
  System.out.println("姓名:" + this.string + " 年龄: " + this.age);
 }

 public static void main(String[] args) {
  Flower flower = new Flower();
  Flower flower1 = new Flower("leon");
  Flower flower2 = new Flower("leon", 12);
 }
}

import java.util.Random;
public class DiceRoller {
 private int dice;
 private int roll;
 private Random rand = new Random();
 // constructor
 public DiceRoller(int sides) {
 dice = sides;
 }

public void Roller() {
 roll = rand.nextInt(dice);
 roll += 1;
 System.out.println (roll);
}