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Java Exercises: Remove all occurrences of a specified value in a given array, return the new length

Java Basic: Exercise-144 with Solution

Write a Java program to remove all occurrences of a specified value in a given array of integers and return the new length of the array.

Pictorial Presentation:

Java Basic Exercises: Remove all occurrences of a specified value in a given array of integers and return the new length of the array.

Sample Solution:

Java Code:

import java.util.*;
public  class Solution {
     /** 
     *@param nums: A list of integers
     *@param element: An integer
     *@return: The new length after remove
     */
  public static int removeElement(int[] nums, int elem) {
      int length = nums.length; 
      if(length==0) return 0; 
      int i=0; 
      for(int j=0; j<length; j++)
      {
        if(nums[j]!=elem)
        {
          nums[i]=nums[j];
          i++; 
        }
      }
      if(i<length) nums[i]='\0';
      return i; 
    }
    public static void main(String[] args) {
		int x = 6;
		int [] nums = {1,4,6,7,6,2};
		System.out.println("Original array: "+Arrays.toString(nums));
        System.out.println("The length of the new array is: " + removeElement(nums, x));
	}		
}

Sample Output:

Original array: [1, 4, 6, 7, 6, 2]
The length of the new array is: 4

Flowchart:

Flowchart: Java exercises: Remove all occurrences of a specified value in a given array of integers and return the new length of the array.

Java Code Editor:

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Next: Write a Java program to remove the nth element from the end of a given list.

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Java: Tips of the Day

Execution of console commands:

Java allows you to execute console commands directly from code using a class Runtime. It is very important not to forget about exception handling.

For example, let's try to open a PDF file through a Java terminal:

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
  
public class ShellCommandExec {
  
  public static void main(String[] args) {
    String gnomeOpenCommand = "gnome-open //home//user//Documents//MyDoc.pdf";
  
    try {
      Runtime rt = Runtime.getRuntime();
      Process processObj = rt.exec(gnomeOpenCommand);
  
      InputStream stdin = processObj.getErrorStream();
      InputStreamReader isr = new InputStreamReader(stdin);
      BufferedReader br = new BufferedReader(isr);
  
      String myoutput = "";
  
      while ((myoutput=br.readLine()) != null) {
        myoutput = myoutput+"\n";
      }
      System.out.println(myoutput);
    }
    catch (Exception e) {
      e.printStackTrace();
    }
  }
}