Strings in Java
Strings in Java are Objects that are backed internally by a char array. Since arrays are immutable(cannot grow), Strings are immutable as well. Whenever a change to a String is made, an entirely new String is created.

Below is the basic syntax for declaring a string in Java programming language.
Syntax: String str = "learnJava";
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8.1 What is the difference between a Choice and a List ?

A Choice is displayed in a compact form that must be pulled down, in order for a user to be able to see the list of all available
choices. Only one item may be selected from a Choice. A List may be displayed in such a way that several List items are visible.
A List supports the selection of one or more List items.
8.2
What is a layout manager ?

A layout manager is the used to organize the components in a container.
8.3
What is the difference between a Scrollbar and a JScrollPane ?

A Scrollbar is a Component, but not a Container. A ScrollPane is a Container. A ScrollPane handles its own events and performs
its own scrolling.
8.4
Which Swing methods are thread-safe ?

There are only three thread-safe methods: repaint, revalidate, and invalidate.
8.5
Name three Component subclasses that support painting.
The Canvas, Frame, Panel, and Applet classes support painting.
8.6
What is clipping ?

Clipping is defined as the process of confining paint operations to a limited area or shape.
8.7
What is the difference between a MenuItem and a CheckboxMenuItem ?

The CheckboxMenuItem class extends the MenuItem class and supports a menu item that may be either checked or unchecked

public class RemoveNonASCIIString{
public static void main(String [] args){
String str = "Instance¡of¥java";
System.out.println(str);
str = str.replaceAll("[^\\p{ASCII}]", "");
System.out.println("After removing non ASCII chars:");
System.out.println(str);
}
}

import java.util.Arrays;
import java.util.LinkedHashSet;

public class ArrayExample
{
    public static void main(String[] args) throws CloneNotSupportedException
    {
        //Array with duplicate elements
        Integer[] numbers = new Integer[] {1,2,3,4,5,1,3,5};
        
        //This array has duplicate elements
        System.out.println( Arrays.toString(numbers) );
        
        //Create set from array elements
        LinkedHashSet<Integer> linkedHashSet = new LinkedHashSet<>( Arrays.asList(numbers) );
        
        //Get back the array without duplicates
        Integer[] numbersWithoutDuplicates = linkedHashSet.toArray(new Integer[] {});
        
        //Verify the array content
        System.out.println( Arrays.toString(numbersWithoutDuplicates) );
    }
}

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