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Drawing a tree in JAVA with asterisks and tabs - can't include floor in the code

My code print a tree with a trunk size of 2 spaces in an array, in the last space it needs also a floor, but i don't know how to implement this, so far my code works like this:
public static void main(String[] args) {
//up part
for(int i=1; i<=5; i++){
for(int k=1; k<=6-i+1; k++){
System.out.print(" ");
}
for(int j=1; j<=2*i-1; j++){
System.out.print("*");
}
System.out.println();
}
// trunk
for(int i=1; i<=2; i++){
for(int k=1; k<=5; k++){
System.out.print(" ");
}
for(int j=1; j<=1; j++){
System.out.print("||");
}
System.out.println();
}
System.out.println("_____||_____");
}
}

//floor
for (int i = 1; i <= 2 * 6; i++) {
System.out.print(i == 6 ? "||" : "_");
}

Java: Formatting nested loops?

I am pretty new to Java and I wanted to make a staircase effect using loops, but adding an increasing amount of spaces to the string as you go down each row.
Heres my code-
for(int i = size; i>0; i--) {
for(int k = 1; k>size-1; k++) {
output+=" ";
}
for(int j = i; j>0; j--) {
output+=let;
}
output+="\n";
}
return output;
}
Ultimately the goal is to have it print this:
22222
2222
222
22
2
But mine prints this:
22222
2222
222
22
2
I'm sorry, I know this is beginner stuff but I don't know where else to go. Any help is appreciated. Thanks.

You need size - i spaces each time, so change for(int k = 1; k>size-1; k++) { to for(int k = 0; k<size-i; k++) {.
for(int i = size; i>0; i--) {
for(int k = 0; k<size-i; k++) {
output+=" ";
}
for(int j = i; j>0; j--) {
output+=let;
}
output+="\n";
}

Try this code:
int size=5;
for(int i = size; i>0; i--) {
for(int k = size-i; k>0; k--) {
System.out.print(" ");
}
for(int j = i; j>0; j--) {
System.out.print("2");
}
System.out.println("");
}
your second for loop condition is wrong.
convert for(int k = 1; k>size-1; k++)into for(int k = size-i; k>0; k--)

Try this:
for(int i=0; i<n; i++)
{
for(int j = 2 * (n-i); j >= 0; j--)
{
System.out.print(" ");
}
for(int j = 0; j<=i; j++)
{
System.out.print("2 ");
}
System.out.println();
}
Note that the int n is the number of lines you want to print
n = 5 -> 5 lines

How to draw X using arrays?

Does anyone have an idea how to print X from given number?
e.g.:
given number 5.
So, I should print
X000X
0X0X0
00X00
0X0X0
X000X
This is my code, still missing something on it
public static void drawX(int number){
int[][] draw = new int[number][number];
for(int i = 0; i< number; i++){
for(int k = 0; k<=i; k++){
System.out.print(" ");
}
for(int j = number-1; j>i; j--){
if(j == number-1 || j == i+1)
System.out.print("X ");
else
System.out.print(" ");
}
System.out.println();
}
for(int i = 0; i< number; i++){
for(int v = number; v>i; v--){
System.out.print(" ");
}
for(int j = 0; j<i; j++){
System.out.print("X ");
}
System.out.println();
}
}

See comments on your code below, highlighting some issues I've noticed. It probably won't solve everything straight away, but it will give you a push in the right direction I hope.
public static void drawX(int number){
// draw is never used.
int[][] draw = new int[number][number];
for(int i = 0; i< number; i++){
for(int k = 0; k<=i; k++){
// Here we print a " " even for k == i.
// Are you sure you want k <= i ?
// If you change it, dont forget to also change
// stop clause in next loop.
System.out.print(" ");
}
for(int j = number-1; j>i; j--){
if(j == number-1 || j == i+1)
// j == number -1 prints X only in the last column
// Maybe you wanted number - i - 1?
// j == i+1 means you "skip" the ith element.
// Why the extra space after X?
System.out.print("X ");
else
// Why two spaces here?
System.out.print(" ");
}
System.out.println();
}
for(int i = 0; i< number; i++){
for(int v = number; v>i; v--){
System.out.print(" ");
}
for(int j = 0; j<i; j++){
// here you need to do very similar logic to
// what you did in previous loop, when printing first
// 'number' lines.
System.out.print("X ");
}
System.out.println();
}
}

Making a single number per line pyramid using nested loop and trying to center it

I have to create a number pyramid using nested loops for homework. I am very new to nested loops and am still not quite clear on how they work completely. My objective is to make this pyramid using nested loops:
-----1-----
----333----
---55555---
--7777777--
-999999999-
however I have only been able to get this:
----------1
--------333--
------55555----
----7777777------
--999999999--------
I think I am on the right track but I am not sure where to go from here.
Here is the code I currently have:
public class NumberPyramid
{
public static void main(String [] args)
{
for(int i=1; i<=9; i+=2)
{
for (int j = 11; j > i; j--)
{
System.out.print("-");
}
for(int j=1; j<=i; j++)
{
System.out.print(i);
}
for (int j = 1; j < i; j++)
{
System.out.print("-");
}
System.out.println();
}
}
}

The part of printing the numbers in the center is correct.
Printing the - before and after the numbers is incorrect.
Notice that for any row, the number of - before and after the numbers should be the same. How many - to print for a number?
For 1, print 5 - before and after.
For 3, print 4 - before and after.
For 5, print 3 - before and after.
That's (11 - i) / 2. Put this loop before and after the center line and you're done.
for (int j = 0; j < (11 - i) / 2; j++) {
System.out.print("-");
}

You should remove two - on every second line
int index = 5;
for (int i=1; i<=9; i+=2) {
for (int j=0; j<index; j++) {
System.out.print("-");
}
for (int k=0; k<i; k++) {
System.out.print(i);
}
for (int j=0; j<index; j++) {
System.out.print("-");
}
System.out.println();
index--;
}

Upside down right triangle in Java

I need to do this:
*****
****
***
**
*
and I have this code:
for (int i=0; i<5; i++)
{
for (int j=5; j>i; j--)
{
System.out.print("*");
}
System.out.println("");
which outputs this:
*****
****
***
**
*
I cant figure out how to implement the spaces. Any help appreciated.

You need to use two for-loops: one for the number of spaces and one for the number of *:
for (int i = 0; i < 5; i++) {
for (int j = 0; j < i; j++) {
System.out.print(" ");
}
for (int j = i; j < 5; j++) {
System.out.print("*");
}
System.out.println();
}
Java 8 solution:
IntStream.range(0, 5).forEach(i -> {
IntStream.range(0, i).forEach(j -> System.out.print(" "));
IntStream.range(i, 5).forEach(j -> System.out.print("*"));
System.out.println();
});

Here's a solution with one less loop than the other answers, if you really want to wow the person who's grading your assignment:
for (int y = 0; y < 5; y++) {
for (int x = 0; x < 5; x++) {
System.out.print((x >= y) ? "*" : " ");
}
System.out.println();
}

Just print k number of spaces before start of every line.
To solve this kind of problems, it will be easy if you break it down and observe the pattern.
***** 0 space
**** 1 space
*** 2 spaces
** 3 spaces
* 4 spaces
After taking note of this pattern, you ask yourself will you be able to print this?
0*****
1****
2***
3**
4*
We see that the number is similar to the start of every line. Hence we could make use of variable i. (your outer loop counter) and we have..
for (int i=0; i<5; i++){
System.out.println(i);
for (int j=5; j>i; j--){
System.out.print("*");
}
System.out.println("");
}
Now, you just have to convert your numbers at the start of every line to the number of spaces and you have..
for (int i=0; i<5; i++){
for(int k=0; k<i; k++) //using i to control number of spaces
System.out.println(" ");
for (int j=5; j>i; j--){
System.out.print("*");
}
System.out.println("");
}

int count = 6;
for(int i=0; i<=count; i++) {
for(int j=0; j<i; j++) {
System.out.print(" ");
}
for (int j = 0; j <= (count - i); j ++) {
System.out.print("*");
}
System.out.println();
}
you can pass your value into count, its works pretty nice.