CONTOH KODE MENU

import java.io.*;
class ujian
{
public static void main (String [] args) throws IOException
{
DataInputStream pilih = new DataInputStream (System.in);
System.out.println("");
System.out.println("----Menu-----");
System.out.println("1.Biodata");
System.out.println("2.Perulangan");
System.out.println("3.Kondisi");
System.out.println("4.exit");
System.out.println("--------------");
System.out.print("Pilihan Anda : ");
int p = Integer.parseInt (pilih.readLine());
switch(p)
{
case 1:
DataInputStream data = new DataInputStream (System.in);
System.out.println("");
System.out.println("-----Biodata-----");
System.out.print("Masukan Nama Anda : ");
String nama = String.valueOf(data.readLine());
System.out.print("Masukan Npm : ");
String npm = String.valueOf(data.readLine());
System.out.print("Masukan Kelas : ");
String kelas = String.valueOf(data.readLine());
System.out.println("");
System.out.println("Nama : "+nama);
System.out.println("Npm : "+npm);
System.out.println("Kelas : "+kelas);
break;
case 2:
DataInputStream angka = new DataInputStream (System.in);
System.out.println("");
System.out.print("Masukan Angka = ");
int d = Integer.parseInt(angka.readLine());
int a,b,c;
for ( a = 1;a<=d;a++)
{c=0;
for (b = 1;b<=a;b++)
{ c=c+b;
if (b==a){

System.out.print(b);
System.out.print ("=");
System.out.print (c);
}
else{
System.out.print(b);
System.out.print ("+");
}
}System.out.println (" ");
}
break;
case 3:
DataInputStream nilai = new DataInputStream (System.in);
System.out.println("");
System.out.print("Masukan Angka = ");
int n = Integer.parseInt(nilai.readLine());
if (n % 2 ==0){
System.out.println ("Genap");
}
else{
System.out.println ("Ganjil");
}
System.out.println("");

break;
case 4:
System.out.println("Terima Kasih");
break;
default:
System.out.println("Pilihan Salah");
break;
}}}


KODe Prog Bintang ke bawah
import java.io.*;
class deret{

public static void main(String args[])throws Exception{
DataInputStream angka = new DataInputStream(System.in);
System.out.println("Masukan jumlah angka : ");
int n = Integer.parseInt(angka.readLine());
int a,b;
for (a=1;a<=n;a++){
for (b=1;b<=a;b=b+1){
System.out.print("*");
}
System.out.println("");
}
for (a=n;a==1;a++){

System.out.print(" *");
}
System.out.println("");
}
}

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