Java basic knowledge-circular output-cannot stop "Pyramid"

For (;) {} in loop output is the most common. The "Pyramid" has the most encoding methods.

1. Right-click the "Pyramid"

X

Xx

Xxx

Xxxx

Method

For (INT I = 0; I <4; I ++ ){
For (Int J = 0; j <= I; j ++)
{
System. Out. Print ("X ");
}
System. Out. println ();
}

2. Right-click the "Pyramid"

Xxxx

Xxx

Xx

X

Method 1

For (INT I = 0; I <4; I ++ ){
For (Int J = 3; j> = I; j --)
{
System. Out. Print ("X ");
}
System. Out. println ();
}

Method 2

For (INT I = 0; I <4; I ++ ){
For (Int J = 0; j <4-I; j ++)
{
System. Out. Print ("X ");
}
System. Out. println ();
}

3. The "pyramid"

X

Xxx

XXXXX

Xxxxxxx

Method

For (INT I = 1; I <= 4; I ++ ){
For (Int J = 1; j <= 4-I; j ++)
{
System. Out. Print ("");
}
For (int K = 1; k <= (I-1) * 2 + 1; k ++)
{
System. Out. Print ("*");
}
System. Out. println ();
}

4. Hollow "Pyramid"

X

X

X

Xxxxxxx

Method 1:

For (INT I = 1; I <= 4; I ++ ){
For (Int J = 1; j <= 4-I; j ++)
{
System. Out. Print ("");
}
For (int K = 1; k <= (I-1) * 2 + 1; k ++)
{
If (I = 1 | I = 4)
{
System. Out. Print ("*");
} Else {
If (k = 1 | K = (I-1) * 2 + 1)
{
System. Out. Print ("*");
} Else {
System. Out. Print ("");
}
}

}
System. Out. println ();
}

 

Method 2

For (INT I = 1; I <= 4; I ++ ){
For (Int J = 1; j <= 4-I; j ++) {system. Out. Print ("");}
For (int K = 1; k <= (I-1) * 2 + 1; k ++)
{
If (I = 1 | I = 4) {system. Out. Print ("*");}
Else if (k = 1 | K = (I-1) * 2 + 1) {system. Out. Print ("*");}
Else {system. Out. Print ("");}
}
System. Out. println ();
}