Example1Chapter2

package com.gmail.kudr641;

import java.util.Scanner;

public class Example1Chapter2 
{
	public static void main(String[] args) 
	{
		Scanner scanner = new Scanner(System.in);
		
		System.out.println("Input a:");
		int max = scanner.nextInt();
		
		System.out.println("Input b:");
		int b = scanner.nextInt();
		
		System.out.println("Input c:");
		int c = scanner.nextInt();
		
		System.out.println("Input d:");
		int d = scanner.nextInt();
		
		scanner.close();
		
		if(max < b){
			max = b;
		}if(max < c){
			max = c;
		}if(max < d){
			max = d;
		}
		
		System.out.println("max: "+max);
	}
}

Example2Chapter2

package com.gmail.kudr641;

import java.util.Scanner;

public class Example2Chapter2 {

	public static void main(String[] args) {

		Scanner scanner = new Scanner(System.in);

		System.out.println("Enter the number of the apartment: ");
		int number = scanner.nextInt();

		scanner.close();

		if (number > 144) {
			System.out.println("There is no apartments");
		}
		int access = 1;
		int floor = 1;
		for (int i = 1; i < number; i += 1) {
			if (i % 36 == 0) {
				access += 1;
			}
			if (i % 4 == 0) {
				floor += 1;
			}
		}

		floor %= 9;

		if (floor == 0) {
			floor = 9;
		}
		System.out.print("Access: " + access + " Floor: " + floor);

	}

}

Example3Chapter2

package com.gmail.kudr641;

import java.util.Scanner;

public class Example3Chapter2 {

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);

		System.out.println("Input year: ");
		int year = scanner.nextInt();
		scanner.close();

		String leapYear = "Is leap-year";
		if (year % 4 == 0) {
			leapYear = "Is leap-year";
		}
		if (year % 100 == 0) {
			leapYear = "Is  not leap-year";
		}
		if (year % 400 == 0) {
			leapYear = "Is leap-year";
		}
		if (year % 4 != 0) {
			leapYear = "Is not leap-year";
		}
		System.out.println(leapYear);
	}
}

Example4Chapter2

package com.gmail.kudr641;

import java.util.Scanner;

public class Example4Chapter2 {

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);		
		
		System.out.println("Input a: ");
		double a = scanner.nextDouble();
		
		System.out.println("Input b: ");
		double b = scanner.nextDouble();
		
		System.out.println("Input c: ");
		double c = scanner.nextDouble();
		
		scanner.close();
		
		if(a + b <= c || b + c <= a || a + c <= b){
			System.out.println("Is not treangle");
		}else{
			System.out.println("Is treangle");
		}
		
	}
}