HR30 Day 4: Class vs. Instance/Java

개요

• HR30 Day 4: Class vs. Instance

import java.io.*;
import java.util.*;

public class Person {
	private int age;	
	public Person(int initialAge) {
		// Add some more code to run some checks on initialAge
		if( initialAge < 0 ) {
			System.out.println("Age is not valid, setting age to 0.");
			initialAge = 0;	
		}
		this.age = initialAge;
	}
	public void amIOld() {
		// Write code determining if this person's age is old and print the correct statement:
		if( this.age < 13 ) {
			System.out.println("You are young.");
			return;
		}
		if( this.age < 18 ) {
			System.out.println("You are a teenager.");
			return;
		}
		System.out.println("You are old.");
	}
	public void yearPasses() {
		// Increment this person's age.
		this.age++;
	}

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int T = sc.nextInt();
		for (int i = 0; i < T; i++) {
			int age = sc.nextInt();
			Person p = new Person(age);
			p.amIOld();
			for (int j = 0; j < 3; j++) {
				p.yearPasses();
			}
			p.amIOld();
			System.out.println();
		}
		sc.close();
	}
}