Question

(Sort ArrayList) Write the following method that sorts an ArrayList: public static > void sort(ArrayList list) Write a program to test the method with three different arrays: Integers: 2, 4, and 3; Doubles: 3.4, 1.2, and -12.3; Strings: "Bob", "Alice", "Ted", and "Carol" This program is similar to the Case Study in the book: Sorting an Array of Objects

The language must be written, compiled, and run on TEXTPAD. The Language is in Java.

Answer 1

I have did the 3 methods in the program.

1> Strings are compared using compareTo() method

2>In Doubles values compared using comparison operator

3> And in Integers values are sorted by using java's inbuilt sorting method of array class as Arrays.sort()

In every method array is printed using toString() method of java.

that is array is converted to string and printed. using this method you can

print array without using loop.

You can use loop also to print array values one by one.

import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.Arrays;
public class MyClass
{
   public static void main(String[] args) {
String mySArr[] = {"Bob", "Alice", "Ted", "Carol"};
int Ssize = mySArr.length;
double myDArr[] = {3.4, 1.2, -12.3};
int dsize = myDArr.length;
int myIArr[] = {2,4,3};
  
       sorting s = new sorting();
       s.Strings(mySArr, Ssize);
       s.Doubles(myDArr, dsize);
       s.Integers(myIArr);
   }
}
class sorting {
public void Strings(String myArray[], int size)
{
for(int i = 0; i<size-1; i++) {
for (int j = i+1; j<myArray.length; j++) {
if(myArray[i].compareTo(myArray[j])>0) {
String temp = myArray[i];
myArray[i] = myArray[j];
myArray[j] = temp;
}
}
}
System.out.println(Arrays.toString(myArray));
}
public void Doubles(double myArray[], int size)
{
for(int i = 0; i<size-1; i++)
{   
for (int j = i+1; j<myArray.length; j++) {
if(myArray[i] > myArray[j])
{
double temp = myArray[i];
myArray[i] = myArray[j];
myArray[j] = temp;
}
}
}
System.out.println(Arrays.toString(myArray));
}
public void Integers(int myArray[])
{
Arrays.sort(myArray);
System.out.println(Arrays.toString(myArray));
}
}