Java Basics Part 2

Which is the correct way to write a comment in Java?

(one or more answers)

Which is the correct way to write a multi line comment in Java?

What is the output?

public class ControlStructuresQuiz {
	public static void main(String[] args) {
		int a = 4, b = 3;

		if (a >= b) {
			System.out.print(a);
		} else {
			System.out.print(b);
		}
	}
}

What is the output for c?

public class ControlStructuresQuiz {
	public static void main(String[] args) {
		int a = 5, b = 8, c = 0;

		while (c < 11) {
			if (a < b) {
				a++;
				c = c + 5;
			}
			else {
				c = c + 4;
			}
		}
		
		System.out.print(c);
	}
}

What is the output?

public class DataTypesExample {
    public static void main(String[] args) {
        int a = 0;
        double b = 0.0;
        
        System.out.print(a == b ? true : false);
    }
}

Which is the correct way to print a new line in Java?

Which is the correct way to print a horizontal tab line in Java?

What is the output for a?

public class OperatorQuiz extends Thread {
	public static void main(String[] args) {
		int a = 4, b = 10;

		while (b > a) {
			a++;
			if (a % 4 == 0) {
				break;
			}
		}
	
		System.out.print(a);
	}
}

What is the output for comp?

public class StringQuiz {
	public static void main(String[] args) {
		String s1 = "hello world";
		String s2 = "hello World";
		boolean comp = !s1.equals(s2);
		System.out.print(comp);
	}
}

Multiple inheritance is supported in Java?

What is the output?

public class MixedQuiz extends Thread {
	public static void main(String[] args) {
		int x = 4, y = 8, temp;

		temp = x;
		y++;
		temp--;
		x = y;
		y = temp;
	
		System.out.print(x + ", " + y);
	}
}

What is the output for x (how many loop passes)?

public class OperatorQuiz extends Thread {
	public static void main(String[] args) {
		double a = 20, b = 2;
		int x = 0;

		while (a > b) {
			a--;
			b = b + 4;
			x++;
		}
	
		System.out.print(x);
	}
}

What is the output?

public class MethodsQuiz {
	public static int add(int a, int b) {
		int result;
		result = a + b;
		return result;
	}

	public static void main(String[] args) {
		System.out.println(add(4, 2));
	}
}

What is the output?

public class MethodsQuiz {
	public static int add(int a, int b) {
		int result;
		result = a + b;
		return result;
	}

	public static void main(String[] args) {
		System.out.println(add(4.4, 2.5));
	}
}

What is the output?

public class Cube {
    static int add(int x = 5) {
        x = 12;
        return x + 1;
    }
    public static void main(String[] args) {
        System.out.print(add(10));
    }
}

What is the output for currentNumber?

public class ArraysQuiz {
	public static void main(String[] args) {
		int[] numbers = { 2, 7, 12, 9, 5, 18, 10, 5, 3, 17, 15 };
		int i = 0, currentNumber;

		currentNumber = numbers[0];

		for(i = 1; i < 10; i++) {
			if(currentNumber < numbers[i]) {
				currentNumber = numbers[i];
			}
		}

		System.out.print(currentNumber);
	}
}

What is the output?

public class ArraysQuiz {
	public static void main(String[] args) {
		int[][] myArray = new int[2][3];
 
		myArray[1][0] = 4;
		myArray[1][1] = 5;
		myArray[1][2] = 8;
		myArray[0][0] = 1;
		myArray[0][1] = 8;
		myArray[0][2] = 7;

		for (int i = 0; i < myArray.length; i++) {
			for (int j = 0; j < myArray[i].length; j++) {
				System.out.print(myArray[i][j]);
			}
		}
	}
}

What is the output?

import java.util.ArrayList;

public class Quiz {
    public static void main(String[] args) {
        ArrayList<Integer> myList = new ArrayList<Integer>();

        myList.add(5);
        myList.add(8);
        myList.clear();
        myList.add(3);
        myList.add(5);
        myList.add(9);

        System.out.println(myList.size());
    }
}

What is the output?

import java.util.ArrayList;
import java.util.Iterator;

public class Quiz {
    public static void main(String[] args) {
        ArrayList<Integer> myList = new ArrayList<Integer>();

        myList.add(1);
        myList.add(2);
        myList.add(2);
        myList.add(3);
        myList.add(4);
        myList.add(5);
        myList.add(6);
        myList.add(7);
        myList.remove(2);
        myList.remove(4);
        myList.remove(4);
        myList.remove(4);

        Iterator iter = myList.iterator();
        while (iter.hasNext()) {
            System.out.print(iter.next() + " ");
        }

        System.out.println(myList.size() + 1);
    }
}