Learn to Program JAVA. Learn the Basics.
by: Rodelio P. Barcenas

This program is supposed to display the characters of string "Jack Frost". Each character of the word will be displayed every line. The variable "name" is an object and ".charAt(x) is a method of the object. ".charAt(x)" returns the character pointed by the value of x. Create a file named "getchars.java" and encode the lines below.

public class getchars {

   public static void main(String arg[]) {

     String name; // contains the string value
     name = "Jack Frost";
            // string "Jack Frost" was assigned

     int lname = name.length();
            // get the length of string
     char c;

     for(int x=0;x<lname;x=x+1) { // start of loop
         c = name.charAt(x); // get the char pointed by x
         System.out.println(c);
           // display char w/ line-feed
     } // end for loop

  } // end main

} // end class getchars

The next program will display the characters of the name "Jack Frost" backwards starting with "t" going to "J". Each character is displayed in every line The variable "name" is an object and ".charAt(x) is a method of the object. ".charAt(x)" returns the character pointed by the value of x.

public class reverse {

  public static void main(String arg[]) {

    String name; // contains the string value
    name = "Jack Frost";

    int lname = name.length(); // get the length of string
    char c;

    for(int x=lname-1; x>=0; x--) { // start of loop
       c = name.charAt(x); // get character pointed by x
       System.out.println(c); // display char w/ linefeed
    } // end for loop

  } // end main

}// end class reverse

This program is written to produce a pattern below
if n = 3;
XXX
X
XXX

if n = 4;
XXXX
X
X
XXXX

Solution;
by looking at the pattern, you can see that
a row is printed multiple X during n = 1 and
n = maximum.

else just simply print a single X

public class pattern2 {

  public static void main(String arg[]) {

    int n;
    n=10;

    for(int cnt = 1; cnt <=n; cnt = cnt +1) {
       if (cnt==1 || cnt ==n) { // if n = 1 or max
         for(int x=1; x<=n; x=x+1){
            // then print multiple X
            System.out.print("X");
            }
         System.out.println(); // print a line feed
       }

       else System.out.println("X"); // else just print X

    } // end for loop

  } // end void main

} // end class

This program is written to provide an output pattern
if limit = 4;
1 2 3 4
2 3 4 5
3 4 5 6
4 5 6 7

if limit = 5;
1 2 3 4 5
2 3 4 5 6
3 4 5 6 7
4 5 6 7 8
5 6 7 8 9

public class pattern1 {

  public static void main(String arg[]) {
  int row,col,limit;
  limit = 5;

  for(row=1;row<=limit;row=row+1) {

     for(col=row;col<=limit+row-1;col=col+1) {
        System.out.print(col+" ");
        }
     System.out.println();
     }

  } // end void main

} // end class