java programming

Question 1

Class body

Answer 1

public class classname {
public static void main(String[] args) {
System.out.println(“welcome to java”);
}
}

Question 2

Type conversions

Answer 2

byte < short < int < long < float < double

Question 3

float and double

Answer 3

float a = 22.5f;
double a = 22.5;

Question 4

Type Casting

Answer 4

double myDobule = 3.6
int myInt = (int)myDouble; // = 3

Question 5

Array declaration

Answer 5

int[] studentmarks = new int[6]; // holds 6
boolean[] attendance = new boolean[12]
attendance.length // gets length of array

Question 6

Mult dimensional arrays

Answer 6

int[][] rating = new int[3][4]; // 3 rows, 4 columns

char[][] hellos = new char[2][];
hellos[0] = new char[]{‘H’, ‘e’, ‘l’, ‘l’, ‘o’};
hellos[1] = new char[]{‘H’, ‘i’};

Question 7

if else statement shorthand

Answer 7

(condition) ? expression1 : expression2;

e.g
String result = (marks >=40) ? “Pass” : “Fail”;

Question 8

for each loop

Answer 8

int[] numbers = new int[]{5,100,2000}

for(int number : numbers) {
System.out.println(number);
}

Question 9

Methods

Answer 9

public static int Calculatemin(int num1, int num2){
return result
}