Game Suit China

package suitkomputer;
import java.io.*;
/**
 *
 * @author Natsu
 */
public class Main {

    public static void main(String[] args) {
        System.out.println("Suit Gunting Kertas Batu");
        System.out.println("------------------------");
        System.out.println("1. G untuk Gunting");
        System.out.println("2. K untuk Kertas");
        System.out.println("3. B untuk batu");
        System.out.println("");
        InputStreamReader istream = new InputStreamReader (System.in);
        BufferedReader br = new BufferedReader (istream);
        String input = null;
        boolean inputvalid = false;

       int computer = 0;
       int player = 0;

       while(!inputvalid){
           System.out.print("Tolong Suit yang benar (G/K/B) = ");
           try {
               input =br.readLine();
           } catch (IOException ioe){
               System.out.println("Error pada IO....System Shut down");
               System.exit(1);
               }
           if(input.length()>0);
           switch (input.charAt(0)){
               case 'g':
               case 'G':
               player = 0;
               inputvalid = true;
               break;
               case 'k':
               case  'K':
               player = 1;
               inputvalid = true;
               break;
               case 'B':
               case  'b':
               player = 2;
               inputvalid = true;
               break;

                   }
               }
       computer = (int)(Math.random()*3);
       if (computer == 3){
           computer = 2;
                  }
      switch (computer){
        case 0:
              System.out.println("computer = Gunting");

          switch (player){
          case 0:
              System.out.println("seri");
              break;
          case 1:
              System.out.println("anda Kalah");
              break;
          case 2:
              System.out.println("anda menang");
              break;
              }
               break;
        case 1:
               System.out.println("Computer = Kertas");
          switch (player){
              case 0:
                  System.out.println("anda menang");
              break;
              case 1:
                  System.out.print("Seri");
              break;
              case 2:
                  System.out.println("anda kalah");
              break;
          }
              break;
          case 2:
              System.out.println("komputer = Batu");
              switch (player){
                  case 0:
                      System.out.println("anda kalah");
                  break;
                  case 1:
                      System.out.println("anda menang");
                  break;
                  case 2:
                      System.out.println("seri");
                  break;
              }
              break;
           }
}
}

IF...Else

package ifelse;
import java.io.*;
class Main {

    public static void main(String[] args) {
        InputStreamReader istream = new InputStreamReader(System.in);
        BufferedReader bufRead = new BufferedReader (istream);

        System.out.println("Welcome/Selamat datang");

       try{
           System.out.print("masukkan nilai = ");
           String tes1 = bufRead.readLine();
             double tes = Integer.parseInt(tes1);
        if(tes == 1){
            System.out.println("angka yang anda masukkan bernilai 1");
        }else{
            System.out.println("angka yang anda masukkan tidak bernilai 1");
            
        }
    }
       catch(IOException err){
       }
}
}

Looping

package javaapplication3;
import java.io.*;
class Main {

    public static void main(String[] args) {
        InputStreamReader istream = new InputStreamReader(System.in);
        BufferedReader bufread = new BufferedReader (istream);

        System.out.println("selamat datang/welcome");

        try{
            System.out.println("masukkan jumlah bintang");
            String x = bufread.readLine();
            int z = Integer.parseInt(x);
            for(int i=1;i<=z;i=i+1){
            for(int j=1;j<=i;j=j+1){
                System.out.print("*");
            }
                System.out.println();
            }
            for(int a=z-1;a<=z;a=a-1){
            for(int b=1;b<=a;b=b+1){
                System.out.print("*");
            }
                System.out.println();
            }
        }
        catch (IOException err){
            System.out.print("Error");
        }
        catch(NumberFormatException err) {
               System.out.println("Error Converting Number");

    }
    }
}

Program Gaji

package helloworldapp;
import java.io.*;
public class helloworldapp {

    public static void main(String[] args) {
        InputStreamReader istream = new InputStreamReader(System.in);
        BufferedReader bufread = new BufferedReader(istream);
        System.out.println("porgram gaji");
        try{
            System.out.print("masukan nama anda");
            String nama = bufread.readLine();
            System.out.print("masukkan gaji Rp = ");
            String gaji = bufread.readLine();
            System.out.println("Bunga gaji = 20%");

            int gapok = Integer.parseInt(gaji);
            double bunga = 0.2;
            double tambahan = gapok * bunga;
            double total = gapok + tambahan;
            System.out.println("Gaji pokok anda adalah = Rp "+gapok);
            System.out.println("Tambahan Gaji anda dari Bunga = Rp "+tambahan);
            System.out.println("Total gaji anda bulan ini = Rp "+ total);

        }
        catch(IOException err){

        }

    }

}