Java Triagle, Segitiga, Trapesium

Segitiga Angka

public class segitiga_angka {
    public static void main (String args []) {
    String a="";
    for (int i=1; i<=4; i++) {
    a=a+i;
    System.out.println(a);

}
}
}


Hasil :

1
12
123
1234

Trapesium

public class trapesium {
public static void main (String[] args) {
int baris;
baris=3;
for (int i=1; i<=baris; i++) {
for (int j=1; j<=4; j++) {
if (i<=j)
System.out.print("1");
else
System.out.print(" ");
}
System.out.println();
}
}
}

Hasil :

1111
  111
    11

Triagle Number

public class triangle_num {
    public static void main(String args[]) {
    for (int i=1; i<=5; i++) {
    for (int j=1; j<=5-i; j++) {
    System.out.print(""+j);}
    System.out.println();
}
}
}

Hasil :
1234
123
12
1