Contoh Program Java

1. Latihan 6:
import java.io.*;
public class lat6{
public static void main(String Arg[]) throws IOException{
String str;String NIP;String Nama;String jbt;
double gaji=0;double pajak=0;double total=0;
int Kdj;
BufferedReader Get=new BufferedReader(new InputStreamReader(System.in));
System.out.print("NIP :");NIP = Get.readLine();
System.out.print("Nama :");Nama = Get.readLine();
System.out.print("Kode :");str = Get.readLine();
Kdj=Integer.parseInt(str);
if(Kdj==1){
jbt="Direktur";gaji=5000000;
}else if(Kdj==2){
jbt="Wakil Direktur";gaji=4000000;
}else if(Kdj==3){
jbt="Bendahara";gaji=3000000;
}else if(Kdj==4){
jbt="Staf";gaji=2000000;
}else {
jbt="";gaji=0;
}
pajak=0.1*gaji;
total=gaji-pajak;
System.out.println("Jabatan :"+jbt);
System.out.println("Gaji :"+gaji);
System.out.println("Pajak :"+pajak);
System.out.println("Total :"+total);
}
}

dan lihat hasil nya dibawah ini

2. latihan 7 :

import java.io.*;
public class lat7{

    public static void main(String Arg[]) throws IOException{
    String str;String NIP;String Nama;String jbt;
    double gaji=0;double pajak=0;double total=0;
    int Kdj;
    BufferedReader Get=new BufferedReader(new InputStreamReader(System.in));
    System.out.print("NIP :");NIP = Get.readLine();
    System.out.print("Nama :");Nama = Get.readLine();
    System.out.print("Kode :");str = Get.readLine();
    Kdj=Integer.parseInt(str);
    switch(Kdj){
    case 1 : jbt="Direktur";gaji=5000000;
    break;
    case 2 : jbt="Wakil Direktur";gaji=4000000;
    break;
    case 3 : jbt="Bendahara";gaji=3000000;
    break;
    case 4 : jbt="Staf";gaji=2000000;
    default:
    jbt="";gaji=0;
    }
    pajak=0.1*gaji;
    total=gaji-pajak;
    System.out.println("Jabatan :"+jbt);
    System.out.println("Gaji :"+gaji);
    System.out.println("Pajak :"+pajak);
    System.out.println("Total :"+total);
    }
}


lihat hasilnya dibawah ini

 

3. contoh Perulangan (loop)

loop2.java
class loop2{
    public static void main(String Arg[]{
    int i=1;
    do(
    System.out.println(i);
    i++;
    }While(i !=11);
    }
}

hasilnya :

4. Untuk menghitung kubus 

import java.io.*;
class loop4{
public static void main(String Arg[]) throws IOException {
int pil,l s, r, p;
double ls,vol;
String str;
BufferedReader Get=new BufferedReader(new InputStreamReader(System.in));
do{
    System.out.println("Menu Utama");
    System.out.printl("1.Hitung Volume Kubus");
    System.out.println("2.Hitung Luas");
    System.out.println("3.Hitung Luas Lingkaran");
    System.out.println("4.Keluar Prograram");
    System.out.print("Pilihan Anda:");str=Get.readLine();
    pil=Integer.parseInt(str);
    switch(pil){
    case 1:
    System.out.println("Menghitung Volume Kubus");
    System.out.print("Sisi:");str=Get.readLine();
    s=Integer.parseInt(str);
    vol=s*s*s;
    System.out.println("Menghitung Luas Persegi Panjang");
    System.out.print("Lebar    :");str=Get.readLine();
    1=Integer.parseInt(str);
    System.out.print("Panjang:");str=Get.readLine();
    p=Integer.parseInt(str);
    ls=p*l;
    System.out.prinln("Luas Persegi Panjang:"+ls);
    break;
    case 3:
    System.out.println("Menghitung Luas Lingkaran");
    System.out.print("Jari Jari:");str=Get.readLine();
    r=Integer.paseInt(str);
    ls=3.14*r*r;
    System.out.print("Luas Lingkaran:"+ls);
    break;
    }
    str=Get.readLine();
    }while(pil!=4);
}
}

hasilnya :