ini adalah kode syntax dalam pemrograman input data dalam java

import java.io.*;
class EkoShift21
{
public static void main(String[] args) throws Exception
{
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));


String firstnumber="";
String secondnumber="";
String type= "";
System.out.println("please input first number :");
firstnumber = br.readLine();
System.out.println("please input second number :");
secondnumber = br.readLine();
System.out.println("please select type of operation :");
System.out.println("1 untuk penjumlahan ");
System.out.println("2 untuk pengurangan ");
System.out.println("3 untuk perkalian ");
System.out.println("4 untuk pembagian ");
System.out.println("please input options :");
type = br.readLine();

int k,l,m,o,p,q;
double r;

k = Integer.parseInt(firstnumber);
l = Integer.parseInt(secondnumber);
m = Integer.parseInt(type);
o = k+l;
p = k-l;
q = k*l;
r = k/l;


switch (m)
{
case 1: System.out.println("Hasilnya pertambahannya adalah "+o);
break;
case 2: System.out.println("Hasilnya pengurangannya adalah "+p);
break;
case 3: System.out.println("Hasilnya perkaliannya adalah "+q);
break;
case 4: System.out.println("Hasilnya pembagiannya adalah "+r);
break;
}}}
     

ini adalah code syntax dalam pemrograman Swing dalam java

import javax.swing.JOptionPane;
class EkoSwing
{
    public static void main(String[] args)
    {
        int banyak;
        String [][] bentuk = new String [80][30];
        banyak=Integer.parseInt(JOptionPane.showInputDialog(null,"masukkan banyak;"));
        for (int i=0;i<banyak;i++  ){
        for (int j=0;j<banyak;j++ ){
            if((i==j)||(i+j==banyak-1)){
                bentuk [i][j]="*";
            }
        else{
            bentuk[i][j]=" ";
        }
                System.out.print(bentuk[i][j]);
        }
            System.out.println();
        }
    }
}
       
   

   
       
   

ini adalah code syntax untuk pemrograman EntryAdd dalam program java

public class EntryAdd
{
    private String[] name = new String[100];
    private String[] address = new String[100];
    private String[] phone = new String[100];
    private String[] email = new String[100];
   
    private static int entryCount;
    private static int index;
    private static int entry;
    private static int entry1;

    public static int getEntryCount()
    {
        return entryCount;
    }

    public String getName(int index)
    {
        return name[index];
    }
    public String getAddress(int index)
    {
        return address[index];
    }
    public String getPhone(int index)
    {
        return phone[index];
    }
    public String getEmail(int index)
    {
        return email[index];
    }

    public void setEntry(String name, String address, String phone, String email, int index)
    {
        this.name[index] = name;
        this.address[index] = address;
        this.phone[index] = phone;
        this.email[index] = email;
    }
}

ini adalah code syntax untuk menampilkan BookAdd pada program java

import java.io.*;

public class BookAdd
{
    public static void main(String[] args) throws Exception
    {
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        String choice=null, jumlah=null, back=null, add=null;
        String[] name = new String[100];
        String[] address = new String[100];
        String[] phone = new String[100];
        String[] email = new String[100];
        int choicex, total=0, menu=0;
        EntryAdd newEntry = new EntryAdd();

        while (menu==0)
        {
        System.out.println();
        System.out.println(" _______________________________ ");
        System.out.println("|___________MAIN_MENU___________|");
        System.out.println("|_1._Add_Entry__________________|");
        System.out.println("|_2._Remove_Entry_______________|");
        System.out.println("|_3._Show_All_Entries___________|");
        System.out.println("|_4._Update_Entry_______________|");
        System.out.println("|______________END______________|");
        System.out.println();
        System.out.print("From the menu above, pick one number: ");
        choice = in.readLine();
        choicex = Integer.parseInt(choice);

        int x=choicex;
        switch (x)
        {
        case 1:
            System.out.print("Input number of entry you want to add: ");
            add = in.readLine();
            total = Integer.parseInt(add);
            for (int i=0; i<total; i++)
            {
                if (total>1)
                {
                    System.out.println("Input entry NO"+(i+1));
                }
                System.out.print("Name: ");
                name[i] = in.readLine();
                System.out.print("Address: ");
                address[i] = in.readLine();
                System.out.print("Phone number: ");
                phone[i] = in.readLine();
                System.out.print("E-mail: ");
                email[i] = in.readLine();
                newEntry.setEntry(name[i], address[i], phone[i], email[i], i);
                System.out.println();
                System.out.println(" _________________________________ ");
                System.out.println(" ____________ENTRY_NO"+(i+1)+"____________");
                System.out.println("  Name        :  "+newEntry.getName(i));
                System.out.println("  Address    :  "+newEntry.getAddress(i));
                System.out.println("  Phone        :  "+newEntry.getPhone(i));
                System.out.println("  E-mail    :  "+newEntry.getEmail(i));
                System.out.println(" _______________END_______________");
                System.out.println();
            }
            break;
       
        case 2:
            String del=null;
            int delx;
            if (total>0)
            {
                System.out.print("Which entry number will you delete? = ");
                del = in.readLine();
                delx = Integer.parseInt(del);
                name[(delx-1)] = "";
                address[(delx-1)] = "";
                phone[(delx-1)] = "";
                email[(delx-1)] = "";
                newEntry.setEntry(name[(delx-1)], address[(delx-1)], phone[(delx-1)], email[(delx-1)], (delx-1));
                System.out.println("Entry NO"+delx+" has been deleted.");
            }
            else System.out.println("You don't have any entries yet.");
            break;
       
        case 3:
            if (total > 0)
            {
                System.out.println("Showing all entries:");
                for (int j=0; j<total; j++)
                {
                    System.out.println();
                    System.out.println(" _________________________________ ");
                    System.out.println(" ____________ENTRY_NO"+(j+1)+"____________");
                    System.out.println("  Name        :  "+newEntry.getName(j));
                    System.out.println("  Address    :  "+newEntry.getAddress(j));
                    System.out.println("  Phone        :  "+newEntry.getPhone(j));
                    System.out.println("  E-mail    :  "+newEntry.getEmail(j));
                    System.out.println(" _______________END_______________");
                    System.out.println();
                }
            }
            else System.out.println("You don't have any entries yet.");
            break;

        case 4:
            String mod=null;
            int modx;
            if (total>0)
            {
            System.out.print("Which entry number will you modified? = " );
            mod = in.readLine();
            modx = Integer.parseInt(mod);
            System.out.println();
            System.out.println(" _________________________________ ");
            System.out.println(" ____________ENTRY_NO"+(modx)+"____________");
            System.out.println("  Name        :  "+newEntry.getName(modx-1));
            System.out.println("  Address    :  "+newEntry.getAddress(modx-1));
            System.out.println("  Phone        :  "+newEntry.getPhone(modx-1));
            System.out.println("  E-mail    :  "+newEntry.getEmail(modx-1));
            System.out.println(" _______________END_______________");
            System.out.println();
           
            System.out.println("Modifying entry NO"+modx+" now.");
            System.out.print("Name: ");
            name[(modx-1)] = in.readLine();
            System.out.print("Address: ");
            address[(modx-1)] = in.readLine();
            System.out.print("Phone number: ");
            phone[(modx-1)] = in.readLine();
            System.out.print("E-mail: ");
            email[(modx-1)] = in.readLine();
            newEntry.setEntry(name[(modx-1)], address[(modx-1)], phone[(modx-1)], email[(modx-1)], (modx-1));
            System.out.println("Showing the updated entry:");
            System.out.println();
            System.out.println(" _________________________________ ");
            System.out.println(" ____________ENTRY_NO"+(modx)+"____________");
            System.out.println("  Name        :  "+newEntry.getName((modx-1)));
            System.out.println("  Address    :  "+newEntry.getAddress((modx-1)));
            System.out.println("  Phone        :  "+newEntry.getPhone((modx-1)));
            System.out.println("  E-mail    :  "+newEntry.getEmail((modx-1)));
            System.out.println(" _______________END_______________");
            System.out.println();
            }
        }
        System.out.print("Return to main menu? (Y/N) = ");
        back = in.readLine();
        if ((back.equals("N")) || (back.equals("n")))
        {
            menu++;
        }
        else if ((back.equals("Y")) || (back.equals("y")))
        {
            System.out.println("Returning to main menu...");
        }
        }
    }
}