Question

Need help with a few questions! Using the JAVA language please.

1) exercises - branching

Write a method whatToWear(int temp) that takes a temperature and then outputs a string for what to wear in different weather conditions. There must be at least 3 categories. For example, whatToWear(90) might return “shorts” and whatToWear(30) might return “down coat”

2) Enum exercise

• Define an enum Seasons, and rewrite the whatToWear method to use enums and switch statement

8) 2D array exercise

1. write a method columnSum(int[][] a, int col) that returns the sum of the values of column col

2. Write a method public static boolean isSquare(int[][] a) that checks if the array is square (i.e. every row has the same length as a itself)

9) Classes Exercise

• Consider a class Student

• Think of four instance variables

• Write four possible constructors

10) Classes exercise

• Define a class BlogEntry that has variables

• username

• text

• date

Methods

• getters/setters

• displayEntry()

• getSummary() // return first 10 words

11) Ragged array exercise

Create a ragged array with contents:

0

1 2

3 4 5

6 7 8 9

10 11 12 13 14

Thanks in advance.

Answer 1

Note : Sudden power cut..i will update remaining...thank u

____________________________

1)

// BasedOnTemp.java

public class BasedOnTemp {
   public static void main(String args[]) {
       int temp = 40;
       String type = whatToWear(temp);
       System.out.println(type);
   }

   private static String whatToWear(int temp) {
       String str = "";
       if (temp >= 0 && temp <= 35) {
           str = "down coat";
       } else if (temp > 35 && temp <= 50) {
           str = "casuals";
       } else if (temp > 50) {
           str = "shorts";
       }
       return str;

   }
}
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Output:

casuals
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8)

1)

// TwoDArray.java

public class TwoDArray {

   public static void main(String[] args) {
       int arr[][]={{1,2,3},{3,4,5},{4,5,6}};
       for(int i=0;i<arr[0].length;i++)
       {
       System.out.println("Sum of Elements in Column#"+(i+1)+":"+columnSum(arr, i));
       }

   }
   public static int columnSum(int[][] a, int col)
   {
       int sum=0;
       for(int i=0;i<a.length;i++)
       {
           sum+=a[i][col];
       }
       return sum;
   }
}
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Output:

Sum of Elements in Column#1:8
Sum of Elements in Column#2:11
Sum of Elements in Column#3:14
__________________________

2)

package org.students;

public class CheckSquare {

   public static void main(String[] args) {
       int arr1[][]={{3,4},{4,5,7},{6,7,8,9}};
      
boolean b=isSquare(arr1);  
if(b)
{
   System.out.println("The 2-D array is square");
}
else
{
   System.out.println("The 2-D array is not square");
}
int arr2[][]={{3,4,5},{4,5,7},{6,7,8}};
       
b=isSquare(arr2);  
if(b)
{
   System.out.println("The 2-D array is square");
}
else
{
   System.out.println("The 2-D array is not square");
}
  

   }
   public static boolean isSquare(int[][] a)
   {
       for(int i=0;i<a.length;i++)
       {
           if(a.length!=a[i].length)
           {
               return false;
           }
       }
       return true;
   }

}
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Output:

The 2-D array is not square
The 2-D array is square

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