Quashzs in Me

import java.io.*;

import javax.swing.*;

class menuLA

{

public static void main(String[]args)

{

do

{

String temp = JOptionPane.showInputDialog("Menu\n1. Biodata\n2. Grade Nilai\n3. Deret\n4. Matriks\n5.KELUAR");

int pil = Integer.parseInt(temp);

switch(pil)

{

case 1:

String nama = JOptionPane.showInputDialog("Masukkan nama : ");

String npm = JOptionPane.showInputDialog("Masukkan npm : ");

String kls = JOptionPane.showInputDialog("Masukkan kelas : ");

JOptionPane.showMessageDialog(null,"nama : "+nama+"\nNPM : "+npm+"\nKelas : "+kls);

break;

case 2:

String temp1 = JOptionPane.showInputDialog("Masukkan Nilai UTS : ");

int uts = Integer.parseInt(temp1);

String temp2 = JOptionPane.showInputDialog("Masukkan Nilai UAS : ");

int uas = Integer.parseInt(temp2);

double total = (uts*0.7)+(uas*0.3);

if ((total>=80)&&(total<=90))

{

JOptionPane.showMessageDialog(null,"Nilai Akhir Anda :"+total+"\nAnda Lulus dengan nilai A");

}

else if ((total>=70)&&(total<=79))

{

JOptionPane.showMessageDialog(null,"Nilai Akhir Anda :"+total+"\nAnda Lulus dengan nilai B");

}

else if ((total>=60)&&(total<=69))

{

JOptionPane.showMessageDialog(null,"Nilai Akhir Anda :"+total+"\nAnda Lulus dengan nilai C");

}

else if ((total>=50)&&(total<=59))

{

JOptionPane.showMessageDialog(null,"Nilai Akhir Anda :"+total+"\nAnda Lulus dengan nilai D");

}

else

{

JOptionPane.showMessageDialog(null,"Nilai Akhir Anda :"+total+"\nAnda Lulus dengan nilai E");

}

break;

case 3:

String temp3 = JOptionPane.showInputDialog (" Masukkan Jumlah Deret:");

int deret =Integer.parseInt(temp3);

String hasil = " ";

for (int i=1;i<= deret;i++)

{

for (int j=1;j<= i;j++)

{

hasil = hasil+j;

}

hasil = hasil+"\n";

}

JOptionPane.showMessageDialog(null,hasil);

break;

case 4:

String[][]bil = new String[3][3];

int[][] a = new int[2][2];

int[][] b = new int[2][2];

for(int i=0;i<2;i++)

{

for(int j=0;j<2;j++)

{

bil[i][j] = JOptionPane.showInputDialog("Matriks A = "+i+" "+j);

a[i][j] = Integer.parseInt(bil[i][j]);

}

}

JOptionPane.showMessageDialog(null,"Matriks A\n"+a[0][0]+" "+a[0][1]+"\n"+a[1][0]+" "+a[1][1]);

case 5:

JOptionPane.showMessageDialog(null,"Terima Kasih Telah Memakai Program Ini");

System.exit(0);

break;

default:

JOptionPane.showMessageDialog(null,"Maaf Pilihan Anda Salah");

}

}

while(true);

}

}