Practice: Java Programs

BowTie.java

public class BowTie {
    public static void main(String args[]) {
        int n = Integer.parseInt(args[0]);
        for(int i=0; i<2*n+1; i++) {
            for(int j=0; j<2*n+1; j++) {
                if ((j>i && j<2*n-i) || (j>(2*n-i) && j<i && i>n))
                    System.out.print(" . ");
                else
                    System.out.print(" * ");       
            }
            System.out.println();
        }
    }
}

/*
    $ javac BowTie.java && java BowTie 3
    *  .  .  .  .  .  *
    *  *  .  .  .  *  *
    *  *  *  .  *  *  *
    *  *  *  *  *  *  *
    *  *  *  .  *  *  *
    *  *  .  .  .  *  *
    *  .  .  .  .  .  *
*/

Ex.java

public class Ex {
    public static void main(String args[]) {
        int n = Integer.parseInt(args[0]);
        for(int i=0; i<2*n+1; i++) {
            for(int j=0; j<2*n+1; j++) {
                if (i==j || j==2*n-i )
                    System.out.print(" * ");
                else
                    System.out.print(" . ");      
            }
            System.out.println();
        }
    }
}

/*
    $ javac Ex.java && java Ex 3
    *  .  .  .  .  .  *
    .  *  .  .  .  *  .
    .  .  *  .  *  .  .
    .  .  .  *  .  .  .
    .  .  *  .  *  .  .
    .  *  .  .  .  *  .
    *  .  .  .  .  .  *
*/

NumPattern.java

public class NumPattern {
    public static void main(String[] args) {
        for(int i =1; i<8; i++) {
            for (int j=1; j<14; j++) {
                if (j<=i)
                    System.out.print(j);
                else if (j>i && j<2*i)
                    System.out.print(2*i-j);
                else
                    System.out.print(" ");
            }
            System.out.println();
        }
    }   
}

/*
    $ javac NumPattern.java && java NumPattern 6
    1            
    121          
    12321        
    1234321      
    123454321    
    12345654321  
    1234567654321
*/

Pay.java

public class Pay {
    int hours;
    float base;
    Pay(int hours, float base) {
        this.hours = hours;
        this.base = base;
    }

    void get_payment() {

        if(this.hours > 60) {
            System.out.print("Error: Overtime");
            return;
        }

        if(this.base < 8.0) {
            System.out.print("Error: Less Base wage");
            return;
        }
        if(this.hours > 40)
            System.out.println(this.base * 40 + (this.base * 1.5 * (this.hours%40)));
        else
            System.out.println(this.base * this.hours);
    }
  
    public static void main(String args[]) {
        Pay e1 = new Pay(40, 10);
        e1.get_payment();
    }
}

/*
  $ javac Pay.java && java Pay
  400.0
*/

Triangle.java

public class Triangle {
    public static void main(String args[]) {
        int n = Integer.parseInt(args[0]);
        for(int i=0; i<n; i++) {
            for(int j=0; j<n; j++) {
                if (j<i)
                    System.out.print(" . ");
                else
                    System.out.print(" * ");
            }
            System.out.println();
        }
    }
}

/*
    $ javac Triangle.java && java Triangle 6
    *  *  *  *  *  *
    .  *  *  *  *  *
    .  .  *  *  *  *
    .  .  .  *  *  *
    .  .  .  .  *  *
    .  .  .  .  .  *
*/