String Class
Input - Reading from the Keyboard
|
Using Scanner Class |
next () and nextLine () |
next () and nextLine () |
Encrpytion Using ASCII Table |
next Method
Will return a reference to a String object that contains from 0 to the number of characters entered at the keyboard.
It will stop when it reaches white space.
nextLine Method
Will return a reference to a String object that contains from 0 to the number of characters entered at the keyboard.
It will read white space and tabs but will end when it reaches a newline character.
import java.util.Scanner;
public class Strings
{
public static void main(String[] args)
{
Scanner keyboard = new Scanner(System.in);
String entry1, entry2, entry3, entry4;
System.out.println("Please enter a sentence");
entry1 = keyboard.next(); //Reads to white space and stays on same line
entry2 = keyboard.next(); //Reads to white space and stays on same line
entry3 = keyboard.next(); //Reads to white space and stays on same line
System.out.println("entry1 = " + entry1);
System.out.println("entry2 = " + entry2);
System.out.println("entry3 = " + entry3);
System.out.println("Please enter another sentence");
keyboard.nextLine(); //moves to next line
entry4 = keyboard.nextLine(); //reads entire line - to the newline character
System.out.println("entry4 = " + entry4);
}
}
This is the first sentence.
entry1 = This
entry2 = is
entry3 = the
Please enter another sentence
This is the second sentence.
entry4 = This is the second sentence.
import java.util.Scanner;
public class Strings
{
public static void main(String[] args)
{
Scanner keyboard = new Scanner(System.in);
String entry1, entry2, entry3, entry4;
System.out.println("Please enter a sentence");
entry1 = keyboard.next(); //Reads to white space and stays on same line
entry2 = keyboard.next(); //Reads to white space and stays on same line
entry3 = keyboard.next(); //Reads to white space and stays on same line
System.out.println("entry1 = " + entry1);
System.out.println("entry2 = " + entry2);
System.out.println("entry3 = " + entry3);
entry4 = keyboard.nextLine(); //Reads remainder of line to the new line character
System.out.println("entry4 = " + entry4);
}
}
Please enter a sentence
This is a sentence.
entry1 = This
entry2 = is
entry3 = a
entry4 = sentence. //Note that the white space entered above was read.
Encryption using
ASCII Table
public
class Strings{
public static void main(String[]args)
{
String string1 = "This is a string.";
System.out.println("The contents of the string:");
for (int i = 0; i < string1.length();i++)
{
System.out.print(string1.charAt(i));
}
System.out.println();
System.out.println("The equivalent ASCII numbers for the string");
for (int j = 0; j < string1.length();j++)
{
System.out.print((int)string1.charAt(j) + " ");
}
System.out.println();
System.out.println("Adding 2 to each of the above numbers");
for (int k = 0; k < string1.length();k++)
{
System.out.print((int)string1.charAt(k) + 2 + " ");
}
System.out.println();
System.out.println("Converting back to characters");
for (int m = 0; m < string1.length();m++)
{
System.out.print((char)((int)string1.charAt(m) + 2));
}
}
}
Output
The equivalent ASCII numbers
for the string
84 104 105 115 32 105 115 32 97 32 115 116 114 105 110 103 46
Adding 2 to each of the above numbers
86 106 107 117 34 107 117 34 99 34 117 118 116 107 112 105 48
Converting back to characters
Vjku"ku"c"uvtkpi0