Need to find a max of three numbers in java [duplicate]

Question

Possible Duplicate:
Find the max of 3 numbers in Java with different data types (Basic Java)

Write a program that uses a scanner to read three integers (positive) displays the biggest number of three. (Please complete without using either of the operators && or ||. These operators will be covered in class shortly. Similarly loops are not required.)

Some sample run: 

Please input 3 integers: 5 8 3
The max of three is: 8

Please input 3 integers: 5 3 1
The max of three is 5

import java.lang.Math;
import java.util.Scanner;
public class max {
    public static void main(String[] args) {
        Scanner keyboard = new Scanner(System.in);
        System.out.println("Please input 3 integers: ");
        String x = keyboard.nextLine();
        String y = keyboard.nextLine();
        String z = keyboard.nextLine();
        int max = Math.max(x,y,z);
        System.out.println(x + " " + y + " "+z);
        System.out.println("The max of three is: " + max);
    }
}   

I want to know what's wrong with this code and how I can find the max when I input 3 different values.

Answer 1

Two things: Change the variables x, y, z as int and call the method as Math.max(Math.max(x,y),z) as it accepts two parameters only.

In Summary, change below:

    String x = keyboard.nextLine();
    String y = keyboard.nextLine();
    String z = keyboard.nextLine();
    int max = Math.max(x,y,z);

to

    int x = keyboard.nextInt();
    int y = keyboard.nextInt();
    int z = keyboard.nextInt();
    int max =  Math.max(Math.max(x,y),z);