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Java Articles
Page 375 of 450
Map to create new value from int array in Java
Let’s say the following is our int array elements:10, 50, 100, 200, 250, 300, 400, 500Here, we are mapping and creating a new value by incrementing each int element with 1:Arrays.stream(new int[] {10, 50, 100, 200, 250, 300, 400, 500}).map(val -> val + 1)Now find the average:Arrays.stream(new int[] {10, 50, 100, 200, 250, 300, 400, 500}).map(val -> val + 1).average()The following is an example to Map and create new value from int array:Exampleimport java.util.Arrays; public class Demo { public static void main(String[] args) throws Exception { Arrays.stream(new int[] {10, 50, 100, 200, 250, 300, 400, 500}).map(val -> val + 1).average() .ifPresent(System.out::println); } }Output227.25
Read MoreJava Program to select the first item in JList
To select the first item in JList, use setSelectionInterval() method:String values[]= { "One", "Two", "Three", "Four", "Five", "Six"}; JList list = new JList(values); int begn = 0; int end = 0; list.setSelectionInterval(begn, end);The following is an example to select the first item in JList:Examplepackage my; import java.awt.event.*; import java.awt.*; import javax.swing.*; class SwingDemo extends JFrame { static JFrame frame; static JList list; public static void main(String[] args) { frame = new JFrame("JList Demo"); SwingDemo s = new SwingDemo(); JPanel panel = new JPanel(); String values[]= ...
Read MoreJava Program to set Selection Mode for JList only for single selection
To set single selection for JList, use DefaultListSelectionModel and set it to SINGLE_SELECTION:String values[]= { "One", "Two", "Three", "Four", "Five", "Six"}; JList list = new JList(values); list.setSelectionMode(DefaultListSelectionModel.SINGLE_SELECTION);The following is an example to set the selection mode for JList only for single selection:Examplepackage my; import java.awt.event.*; import java.awt.*; import javax.swing.*; class SwingDemo extends JFrame { static JFrame frame; static JList list; public static void main(String[] args) { frame = new JFrame("JList Demo"); SwingDemo s = new SwingDemo(); JPanel panel = new JPanel(); String values[]= { ...
Read MoreHow to store string array in Java JList?
To store string array in JList, at first create String array list:String sports[]= { "Football", "Fencing", "Cricket", "Squash", "Hockey", "Rugby"};Now, set it to JList:JList list = new JList(sports);The following is an example to store string array in JList:Examplepackage my; import java.awt.event.*; import java.awt.*; import javax.swing.*; class SwingDemo extends JFrame { static JFrame frame; static JList list; public static void main(String[] args) { frame = new JFrame("JList Demo"); SwingDemo s = new SwingDemo(); JPanel panel = new JPanel(); String sports[]= {"Football", "Fencing", "Cricket", "Squash", "Hockey", "Rugby"}; ...
Read MoreHow to add JList to Scroll pane in Java?
To add JList to Scroll pane in Java, use JScrollPane:JList list = new JList(sports); JScrollPane scrollPane = new JScrollPane(list);After that set it to Container:Container contentPane = frame.getContentPane(); contentPane.add(scrollPane, BorderLayout.CENTER);The following is an example to add JList to Scroll pane:Examplepackage my; import java.awt.event.*; import java.awt.*; import javax.swing.*; class SwingDemo extends JFrame { static JFrame frame; static JList list; public static void main(String[] args) { frame = new JFrame("JList Demo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); String sports[]= {"Tennis", "Archery", "Football", "Fencing", "Cricket", "Squash", "Hockey", "Rugby"}; list = new JList(sports); ...
Read MoreMap to get substring and convert to int in Java
Let’s say the following is our stream:Stream.of("u2", "h9", "s8", "l3")Now, map to get the substring:.map(s -> s.substring(1))Convert to int and find the minimum:.mapToInt(Integer::parseInt) .min()The following is an example to Map and get substring and convert to int:Exampleimport java.util.stream.Stream; public class Demo { public static void main(String[] args) throws Exception { Stream.of("u2", "h9", "s8", "l3") .map(s -> s.substring(1)) .mapToInt(Integer::parseInt) .min() .ifPresent(System.out::println); } }Output2
Read MoreCan we sort a list with Lambda in Java?
Yes, we can sort a list with Lambda. Let us first create a String List:List list = Arrays.asList("LCD", "Laptop", "Mobile", "Device", "LED", "Tablet");Now, sort using Lambda, wherein we will be using compareTo():Collections.sort(list, (String str1, String str2) -> str2.compareTo(str1));The following is an example to sort a list with Lambda in Java:Exampleimport java.util.Arrays; import java.util.Collections; import java.util.List; public class Demo { public static void main(String... args) { List list = Arrays.asList("LCD", "Laptop", "Mobile", "Device", "LED", "Tablet"); System.out.println("List = "+list); Collections.sort(list, (String str1, String str2) -> str2.compareTo(str1)); System.out.println("Sorted List ...
Read MoreSort a list that places nulls first in Java
Let us create a list first with string elements. Some of the elements are null in the List:List list = Arrays.asList("Jack", null, "Thor", null, "Loki", "Peter", null, "Hulk");Now, sort the above list and place nulls first with nullsFirst:list.sort(Comparator.nullsFirst(String::compareTo));The following is an example to sort a List that places nulls first:Exampleimport java.util.Arrays; import java.util.Comparator; import java.util.List; public class Demo { public static void main(String... args) { List list = Arrays.asList("Jack", null, "Thor", null, "Loki", "Peter", null, "Hulk"); System.out.println("Initial List = "+list); list.sort(Comparator.nullsFirst(String::compareTo)); System.out.println("List placing nulls first = "+list); ...
Read MoreJava Program to sort Integer list in reversed order
Following is our integer array:Integer[] arr = {20, 50, 100, 150, 200, 250, 300, 350, 400, 500};Now convert the above Integer array to List:List list = new ArrayList(Arrays.asList(arr));Now, to sort the above Integer list in reversed order:Comparator initialComp = Integer::compare; Comparator revComp = initialComp.reversed(); Collections.sort(list, revComp);The following is an example to sort Integer list in reversed order:Exampleimport java.util.ArrayList; import java.util.Arrays; import java.util.Collections; import java.util.Comparator; import java.util.List; public class Demo { public static void main(String[] args) { Integer[] arr = {20, 50, 100, 150, 200, 250, 300, 350, 400, 500}; List list = new ...
Read MoreHow to sort array of strings by their lengths following shortest to longest pattern in Java
At first, let us create and array of strings:String[] strArr = { "ABCD", "AB", "ABCDEFG", "ABC", "A", "ABCDE", "ABCDEF", "ABCDEFGHIJ" };Now, for shortest to longest pattern, for example A, AB, ABC, ABCD, etc.; get the length of both the string arrays and work them like this:Arrays.sort(strArr, (str1, str2) -> str1.length() - str2.length());The following is an example to sort array of strings by their lengths with shortest to longest pattern:Exampleimport java.util.Arrays; public class Demo { public static void main(String[] args) { String[] strArr = { "ABCD", "AB", "ABCDEFG", "ABC", "A", "ABCDE", "ABCDEF", "ABCDEFGHIJ" }; ...
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