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Object Oriented Programming Articles
Page 483 of 589
default access modifier in Java
Default access modifier means we do not explicitly declare an access modifier for a class, field, method, etc.A variable or method declared without any access control modifier is available to any other class in the same package. The fields in an interface are implicitly public static final and the methods in an interface are by default public.ExampleVariables and methods can be declared without any modifiers, as in the following examples -String version = "1.5.1"; boolean processOrder() { return true; }
Read MoreHow can I clear or empty a StringBuilder in Java.
You can either setLength to be 0 or create a new StringBuilder() instance. See the example below −Examplepublic class Tester { public static void main(String[] args) { StringBuilder builder = new StringBuilder(); builder.append("sample"); System.out.println(builder.toString()); builder.setLength(0); System.out.println(builder.toString()); builder.append("sample"); System.out.println(builder.toString()); } }Outputsample sample
Read MoreBreaking out of nested loop in java
Yes, break statement can be used in nested for loops. It works on the for loop in which it is applied. See the example below.Examplepublic class Tester { public static void main(String[] args) { for(int i = 0; i< 2; i++) { for(int j = 0; j < 2; j++){ if(i == 1) { break; } System.out.println("i = " + i+",j = " + j); } } } }
Read MoreHow to get rows and columns of 2D array in Java?
Following example helps to determine the rows and columns of a two-dimensional array with the use of arrayname.length.ExampleFollowing example helps to determine the upper bound of a two dimensional array with the use of arrayname.length. public class Main { public static void main(String args[]) { String[][] data = new String[2][5]; System.out.println("Dimension 1: " + data.length); System.out.println("Dimension 2: " + data[0].length); } }OutputThe above code sample will produce the following result. Dimension 1: 2 Dimension 2: 5
Read MoreHow to convert comma seperated java string to an array.
Yes, use String.split() method to do it. See the example below −Examplepublic class Tester { public static void main(String[] args) { String text = "This,is,a,comma,seperated,string."; String[] array = text.split(","); for(String value:array) { System.out.print(value + " "); } } }OutputThis is a comma seperated string.
Read MoreHow to print a byte array in Java?
You can simply iterate the byte array and print the byte using System.out.println() method.Examplepublic class Tester { public static void main(String[] args) { byte[] a = { 1,2,3}; for(int i=0; i< a.length ; i++) { System.out.print(a[i] +" "); } } }Output1 2 3
Read Morehow to shuffle a 2D array in java correctly?
Yes. Create a list to represent a 2D array and then use Collections.shuffle(list).Exampleimport java.util.ArrayList; import java.util.Collections; import java.util.List; public class Tester { public static void main(String[] args) { List rows = new ArrayList(); rows.add(new int[]{1,2,3}); rows.add(new int[]{4,5,6}); rows.add(new int[]{7,8,9}); System.out.println("Before Shuffle"); System.out.println("[0][0] : " + rows.get(0)[0]); System.out.println("[1][1] : " + rows.get(1)[1]); System.out.println("After Shuffle"); Collections.shuffle(rows); System.out.println("[0][0] : " + rows.get(0)[0]); System.out.println("[1][1] : " + rows.get(1)[1]); } }OutputBefore Shuffle [0][0] : 1 [1][1] : 5 After Shuffle [0][0] : 7 [1][1] : 2
Read MoreHow to create a dynamic 2D array in Java?
If you wish to create a dynamic 2d array in Java without using List. And only create a dynamic 2d array in Java with normal array then click the below linkYou can achieve the same using List. See the below program. You can have any number of rows or columns.Exampleimport java.util.ArrayList; import java.util.List; public class Tester { public static void main(String[] args) { List rows = new ArrayList(); rows.add(new int[]{1, 2, 3}); rows.add(new int[]{1, 2}); ...
Read MoreHow to create a subarray from another array in Java
Use Arrays.copyOfRange() method to get a subarray.Exampleimport java.util.Arrays; public class Tester { public static void main(String[] args) { int[] array = new int[] {1, 2, 3, 4, 5}; int[] subArray = Arrays.copyOfRange(array, 0, 2); System.out.println("Array: "); for(int i = 0; i < array.length; i++) { System.out.print(array[i] + " "); } System.out.println("Sub array: "); for(int i = 0; i < subArray.length; i++) { System.out.print(subArray[i] + " "); } } }OutputArray: 1 2 3 4 5 Sub array: 1 2
Read MoreRemoval of negative numbers from an array in Java
Following program shows how to remove negative numbers from an array.Exampleimport java.util.ArrayList; import java.util.Iterator; import java.util.List; public class Tester { public static void main(String[] args) { List objArray = new ArrayList(); objArray.clear(); objArray.add(2); objArray.add(-3); objArray.add(4); System.out.println("Array before removing an element "+objArray); Iterator iterator = objArray.iterator(); while(iterator.hasNext()) { Integer next = iterator.next(); if(next < 0) { iterator.remove(); } } System.out.println("Array after removing an element"+objArray); } }OutputArray before removing an element [ 2, -3, 4 ] Array after removing an element [ 2, 4 ]
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