Object Oriented Programming Articles - Page 877 of 915

The addAll(Collection

The indexOf(Object) method of the java.util.ArrayList class returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element.Exampleimport java.util.ArrayList; public class ArrayListDemo {    public static void main(String[] args) {       ArrayList arrlist = new ArrayList(5);       arrlist.add("G");       arrlist.add("E");       arrlist.add("F");       arrlist.add("M");       System.out.println("Size of list: " + arrlist.size());       for (String value : arrlist) {          System.out.println("Value = " + value);       }     ... Read More

The search(Object o) method is used to return the 1-based position where an object is on this stack.Exampleimport java.util.*; public class StackDemo {    public static void main(String args[])  {             Stack st = new Stack();       st.push("Java");       st.push("Source");       st.push("code");       System.out.println("Searching 'code' in stack: "+st.search("code"));    } }OutputSearching 'code' in stack: 

The get(int index) method of the java.util.ArrayList class returns the element at the specified position in this list.Exampleimport java.util.ArrayList; public class ArrayListDemo {    public static void main(String[] args) {       ArrayList arrlist = new ArrayList(5);       arrlist.add(15);       arrlist.add(22);       arrlist.add(30);       arrlist.add(40);       for (Integer number : arrlist) {          System.out.println("Number = " + number);       }       int retval=arrlist.get(3);       System.out.println("Retrieved element is = " + retval);    } }OutputNumber = 15 Number = 22 Number = 30 Number = 40 Retrieved element is = 40

The empty() method is used to test if this stack is or not.Exampleimport java.util.*; public class StackDemo {    public static void main(String args[]) {           Stack st = new Stack();       st.push("Java");       st.push("Source");       st.push("code");       System.out.println("Is stack empty: "+st.empty());    } }OutputIs stack empty: false

The peek() method is used to look at the object at the top of this stack without removing it from the stack.Exampleimport java.util.*; public class StackDemo {    public static void main(String args[]) {             Stack st = new Stack();       st.push("Java");       st.push("Source");       st.push("code");       System.out.println("Top object is: "+st.peek());    } }OutputTop object is: code

Java is a programming language, whereas Core Java is a computing platform. Java Platform Standard Edition is Core Java, which is also called Java SE. The following are the computing following supported by Java, which also has Core Java as its part:Java SE Java Standard Edition used to develop desktop applications. A well-known implementation of Java SE is the Java Development Kit (JDK).Java EE Java Enterprise Edition i.e. Java 2 Platform, Enterprise Edition or J2EE. Java EE is used for applications running on servers. Java ME Java Micro Edition is used for applications running on mobile phones.Java SE is the Standard Edition and also ... Read More

The pop() method is used to remove the object at the top of this stack and returns that object as the value of this function. Example import java.util.*; public class StackDemo { public static void main(String args[]) { Stack st = new Stack(); st.push("Java"); st.push("Source"); st.push("code"); System.out.println("Removed object is: "+st.pop()); System.out.println("Elements after remove: "+st); } } Output Removed object is: code Elements after remove: [Java, Source]

The toArray() method of the java.util.ArrayList class returns an array containing all of the elements in this list in proper sequence (from first to the last element).This acts as a bridge between array-based and collection-based APIs.Exampleimport java.util.ArrayList; public class ArrayListDemo {    public static void main(String[] args) {       ArrayList arrlist = new ArrayList(5);       arrlist.add(20);       arrlist.add(40);       arrlist.add(10);       arrlist.add(15);       arrlist.add(25);       for (Integer number : arrlist) {          System.out.println("Number = " + number);       }       Object[] ... Read More

The push(Object item) method is used to Pushes an item onto the top of this stack.Exampleimport java.util.*; public class StackDemo {    public static void main(String args[]) {       Stack st = new Stack();       st.push("Java");       st.push("Source");       st.push("code");       System.out.println("Elements in the stack: "+st);    } }OutputElements in the stack: [Java, Source, code]