contoh program java, looping atau pengulangan.

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/* tugas_bintang1 */
package latihan;
import javax.swing.*;
public class tugas_bintang1 {
public static void main (String[] args) {
int x;
x=Integer.valueOf(JOptionPane.showInputDialog("MASUKAN BANYAK BINTANG ?"));
for (int i=1; i<=x; i++) {
for (int j=1; j<=x; j++) {
if (j<=i)
System.out.print("*");
else
System.out.print(" ");
}
System.out.println();
}
}

}

output-nya adalah sbb;

*
**
***
****
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------------------------------------------------------------------------------------
/*
tugas_bintang2
*/

package latihan;
import javax.swing.*;
public class tugas_bintang2 {
public static void main (String[] args) {
int baris,x, y;
baris=Integer.valueOf(JOptionPane.showInputDialog("MASUKAN BANYAK BINTANG ?"));
x=baris+1;
for (int i=1; i<=baris; i++) {
for (int j=1; j<=baris; j++) {
y=i+j;
if (y<=x)
System.out.print("*");
else
System.out.print(" ");
}
System.out.println();

}
}
}

output-nya sbb;
****
***
**
*
------------------------------------------------------------------------------------

------------------------------------------------------------------------------------
/*
tugas_bintang3
*/

package latihan;
import javax.swing.*;
public class tugas_bintang3 {
public static void main (String[] args) {
int baris, x, y;
baris=Integer.valueOf(JOptionPane.showInputDialog("MASUKAN BANYAK BINTANG ?"));
x=baris+1;
for (int i=1; i<=baris; i++) {
for (int j=1; j<=baris; j++) {
y=i+j;
if (x<=y)
System.out.print("*");
else
System.out.print(" ");
}
System.out.println();

}
}
}

output-nya sbb;
*
**
***
****
------------------------------------------------------------------------------------

------------------------------------------------------------------------------------
/*
tugas_bintang4
*/

package latihan;
import javax.swing.*;
public class tugas_bintang4 {
public static void main (String[] args) {
int baris;
baris=Integer.valueOf(JOptionPane.showInputDialog("MASUKAN BANYAK BINTANG ?"));
for (int i=1; i<=baris; i++) {
for (int j=1; j<=baris; j++) {
if (i<=j)
System.out.print("*");
else
System.out.print(" ");
}
System.out.println();
}
}
}

output-nya sbb;
****
***
**
*
------------------------------------------------------------------------------------

------------------------------------------------------------------------------------
/*
tugas_bintang5
*/

package latihan;
import javax.swing.*;
public class tugas_bintang5 {
public static void main (String[] args) {
int baris, m;
for (int i=1; i<=7; i++) {
if (i<5) {
for (int j=1; j<=4; j++) {
if (j<=i)
System.out.print("*");
else
System.out.print(" ");
}
}
else {
for (int j=1; j<=4; j++) {
m=i+j;
if (m<=8)
System.out.print("*");
else
System.out.print(" ");
}
}
System.out.println();
}
}
}

output-nya sbb;
*
**
***
****
***
**
*
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