sc.nextline skips

ByAnurag batra October 4, 2022September 6, 2022

int option = input.nextInt();
input.nextLine();  // Consume newline left-over
String str1 = input.nextLine();

Here is what the above code is Doing:
1. It’s asking the user to enter an integer.
2. It’s asking the user to enter a string.
3. It’s asking the user to enter an integer.
4. It’s asking the user to enter a string.

The problem is that the second input.nextLine() call is reading the newline character left-over from the first input.nextLine() call.

To fix this, we can add an extra input.nextLine() call after the first input.nextLine() call to consume the newline character.

ClassCastException Casting toArray() method

Java Examples

ClassCastException Casting toArray() method

ByAnurag batra October 11, 2022September 6, 2022

Collection c = new ArrayList(); Integer obj = new Integer(1); c.add(obj); // this would trigger the rule (and throw a ClassCastException if executed) Integer[] a = (Integer [])c.toArray(); // this is fine and will not trigger the rule Integer[] b = (Integer [])c.toArray(new Integer[c.size()]); Here is what the above code is Doing: 1. Create an…

Java Examples

grunt registertask multiple

ByAnurag batra October 10, 2022September 6, 2022

grunt.registerTask(taskName, [description, ] taskList) grunt.registerTask(‘dist’, [‘concat:dist’, ‘uglify:dist’]); Here is what the above code is Doing: 1. The first argument is the name of the task. 2. The second argument is an array of tasks to run. 3. The third argument is a description of the task.

Java Examples

where to check when you hava a error

ByAnurag batra October 10, 2022September 6, 2022

check the console section right from your project section Here is what the above code is Doing: 1. We are creating a new project 2. We are creating a new dataset 3. We are creating a new table 4. We are uploading the data to the table 5. We are running a query to check…

Java Examples

convert array of int to arraylist java

ByAnurag batra September 17, 2022September 6, 2022

int[] ints = {1, 2, 3}; List intList = new ArrayList(ints.length); for (int i : ints) { intList.add(i); } Here is what the above code is Doing: 1. Create an array of ints 2. Create a new ArrayList of Integers 3. Loop through the array of ints and add each int to the ArrayList

Java Examples

arraylist of double

ByAnurag batra October 20, 2022September 6, 2022

import java.util.ArrayList; public void function(){ ArrayList myList = new ArrayList(); } Here is what the above code is Doing: 1. We create a new ArrayList of type type. 2. We add a new element to the ArrayList. 3. We print out the ArrayList. 4. We remove the element at index 0. 5. We print out…

Java Examples

pasar ejercicios de pseint a java

ByAnurag batra September 16, 2022September 6, 2022

Algoritmo negativo_y_positivo Escribir “Ingrese un numero: ” Leer Num1 Si Num1>0 Entonces Imprimir “Es un numero positivo” SiNo Imprimir “Es un numero negativo” Fin Si FinAlgoritmo Here is what the above code is Doing: 1. It’s asking the user to enter a number. 2. It’s reading the number. 3. It’s checking if the number is…

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