Jajargenjang, Segitiga Siku-siku, belah ketupat dan Segitiga Piramid pada Java

import java.util.Scanner;

public class bangundatar {
public static void main (String args[]){
Scanner input=new Scanner(System.in);
System.out.print ("Masukan Tinggi segitiga : ");
int batas = input.nextInt();


//segitiga siku-siku biasa
System.out.println("Segitiga siku-siku Biasa");
   for(int i=1;i<=batas;i++){//tinggi
    for(int j=1;j<=i;j++){ //perulangan kesamping
     System.out.print("* ");
    }
    System.out.println();
   }

System.out.println();

//Segitiga siku-siku Terbalik
System.out.println("Segitiga siku-siku terbalik");
   for(int i=1;i<=batas;i++){ //tinggi
    for(int j=batas;j>=i;j--){ //perulangan kesamping
     System.out.print("* ");
    }
    System.out.println();
   }

System.out.println();

//segitiga piramid
System.out.println("Segitiga Biasa");

   for(int i=1;i<=batas;i++){//tinggi
    for(int j=batas;j>=i;j--){ //spasi
    System.out.print(" ");
    }
    for(int k=1;k<=i;k++){
    System.out.print("* ");
    }
    System.out.println();
   }

System.out.println();

//segitiga piramid terbalik
System.out.println("Segitiga Biasa Terbalik");
   for(int i=1; i<=batas; i++){//tinggi
    for(int j=1;j<=i;j++) { //karakter spasi
                System.out.print(" ");
    }
    for(int k=batas;k>=i;k--){
                System.out.print("* ");
    }
     System.out.println();
   }

System.out.println();

//Jajar genjang
System.out.println("Jajargenjang");
   for(int i=1; i<=batas; i++){//tinggi
    for(int j=1;j<=i;j++) { //karakter spasi
                System.out.print(" ");
    }
    for(int k=batas;k>=1;k--){
                System.out.print("* ");
    }
     System.out.println();
   }

//Belah ketupat
System.out.println("Belahketupat");
   for(int i=1;i<=batas;i++){//tinggi
    for(int j=batas;j>=i;j--){ //spasi
    System.out.print(" ");
    }
    for(int k=1;k<=i;k++){
    System.out.print("* ");
    }
    System.out.println();
   }
   for(int i=1; i<=batas; i++){//tinggi
    for(int j=1;j<=i+1;j++) { //karakter spasi
                System.out.print(" ");
    }
    for(int k=batas-1;k>=i;k--){
                System.out.print("* ");
    }
     System.out.println();

   }
}
}