Coding Fungsi

package mahasiswa;
import java.util.Scanner;

public class Mahasiswa {

public int a, t, luas ;
public Scanner sc = new Scanner (System.in);
public int luas_s (int alas, int tinggi){
int luas = (alas*tinggi)/2;
return luas;
}
public void ls (){
System.out.print("alas: " );
a=sc.nextInt();
System.out.print("tinggi: ");
t=sc.nextInt();
System.out.println("Luas Segitiga= "+luas_s(a,t));
}

public int p , l , Luas ;
public Scanner sr = new Scanner (System.in);
public int luas_p (int panjang , int lebar){
int Luas = panjang*lebar;
return Luas ;
}
public void lp (){
System.out.print("panjang: " );
p = sr.nextInt();
System.out.print("lebar: " );
l=sr.nextInt();
System.out.println("Luas persegi panjang= "+luas_p(p,l));

}

public static void main(String[] args) {
Mahasiswa m = new Mahasiswa ();
m.lp();
m.ls();

}
}

Class 2

package mahasiswa;

public class lanjutan {
public static void main (String[] args){
lanjutan h = new lanjutan ();
Mahasiswa m = new Mahasiswa ();
m.lp();
m.ls();
}
}

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