Coffee001

Question 1

package com.protoeffect;

public class Test {
    static int count = 0;
    int i = 0;

public void changeCount(){
        while(i<5){
            i++;
            count++;
        }
    }
}

public class Main {
    public static void main(String[] args) {
        Test check1 = new Test();
        Test check2 = new Test();
        check1.changeCount();
        check2.changeCount();
        System.out.println(check1.count + " : " + check2.count);
    }
}

Accepted Answer

10 : 10

Answer

5 : 5

Answer

5 : 10

Answer

Compilation fails

Question 2

package com.protoeffect;

public class Main {
    public static void main(String[] args) {
        String product = "Pen";
        product.toLowerCase();
        product.concat(" BOX".toLowerCase());
        System.out.println(product.substring(4,6));
    }
}

Accepted Answer

An exception is thrown at runtime.

Answer

box

Answer

nbo

Answer

bo

Answer

nb

Question 3

Which three  are advantages of the Java exception mechanism?

Accepted Answer

Improves the program structure because the error handling code is separated from the normal program function.

Accepted Answer

Improves the program structure because the programmer can choose where to handle exceptions.

Accepted Answer

Allows the creation of new exceptions that are tailored to the particular program being created.

Answer

Provides a set of standard exceptions that covers all the possible errors.

Answer

Improves the program structure because exceptions must be handled in the method in which they occurred.

Question 4

package com.protoeffect;

public class Person {
    String name;
    int age = 25;

    public Person(String name) {
        this();                     //line n1
        setName(name);
    }

    public Person(String name, int age){
        Person(name);                     //line n2
        setAge(age);
    }

    //setter and getter methods go here

    public String show(){
        return name + " " + age + " " + number;
    }
}

package com.protoeffect;

public class Main {

    public static void main(String[] args) {
        Person p1 = new Person("Jesse");
        Person p2 = new Person("Walter",52);
        System.out.println(p1.show());
        System.out.println(p2.show());
    }
}

Accepted Answer

Compilation fails at both line n1 and line n2

Answer

Jesse 25
Waller 52

Answer

Compilation fails only at line n1

Answer

Compilation fails only at line n2

Coffee001

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