Infosys Certified Java SE8 Developer

Which of the following options is/are TRUE bout Java constructors? [Select exactly 2 correct options]

What will be the output of the below code?

public class Tester {
public static void main(String[] args) {
String name = "John";
System.out.print(name.matches("[A-z].*{0,}"));
System.out.print(name.matches("[\\w].*{1,4}"));
}
}

Observe the below code:

public class Q5Tester {
public static void main(String[] args) {
int a=3;
int b=9;

//Line 1
{
System.out.print(""+a+""+b);
System.out.print(""+a+""+b);
}
}
}

Which of the following for loop is the correct one to be added at Line 1 to get the output as 310310? [Select exactly 3 correct options]

What will be the output of the below code?

public class Tester {
public static void main(String[] args) {
for(Directions dir : Directions.values())
{
System.out.print(dir.toString());
System.out.print(dir.ordinal());
System.out.println();

}
}
enum Directions{
EAST(1), WEST(2), NORTH(3), SOUTH(4);
int value;
private Directions(int value) {
this.value = value;
}
}
}

Observe the below code snippet:(Assume that class declaration is done properly and it is written in the main method)
int intValue = 100;
float floatValue = 100.0F;
double doubleValue = 100.0D;
char charValue = 100;
byte byteValue = 100;

dataType result = (intValue * byteValue + (doubleValue/floatValue)) * charValue;

Which of the following data types can be used in place of 'dataType' for the identifier 'result' for successful compilation of the program?

Which of the following components in Java Virtual Machine(JVM) is mainly responsible for executing the Java byte codes?

There are 5 method declarations have been given below.
Identify the combination of methods that can be defined in a single Java class without any compilation errors.
Select the most suitable option.

i.void doTask(Integer x, int y){}
ii.void doTask(int x, Integer y){}
iii.void doTask(int x, int y){}
iv.void doTask(Integer x, Integer y){}
v.void doTask(Integer x, Integer y, int z){}

What will be the output the below code when executed?

public class Tester {
public static void main(String[] args) {
int intValue = 100;
String strValue = "John";
float floatValue = 20.0f;

if (intValue > 100 || strValue == "John" && floatValue < 20.01f) {
System.out.println("if");
} else if (intValue >= 100 || strValue.endsWith("John") || floatValue < 21.01f) {
System.out.println("elseif-1");
} else if (intValue == 100 || strValue.startsWith("John") || floatValue > 19.01f) {
System.out.println("elseif-2");
} else {
System.out.println("else");
}
}
}

Observe the below code developer by John. He's getting a Warning Line 4 as "The value of the local variable intValue is not used". Help John to supress that warning.
//Line 1
public class Tester {
//Line 2
public static void main(String[] args) {
//Line 3
int intValue = 0; //Line 4: Warning: The value of the local variable intValue is not used
String strValue = "John";

System.out.println(strValue);
}
}

Which of the following approaches John can follow to suppress the Warning occurring at Line 4?

What will be the output of the below code?

import java.util.Arrays;

public class Tester {
public static void main(String[] args) {
String arr[] = {"Z", "H", "B", "A", "X"};
Arrays.sort(arr);
Arrays.copyOf(arr, 6);
Arrays.fill(arr, 4, 5, "X");
Arrays.toString(arr);
for (String str : arr) {
System.out.print(str);
}
}
}