How to write a for loop in java

See also the associated CodingBat java loop practice problems using strings and arrays.

How to write a for loop in java

How did we produce such a table? Well, our code uses two for loops to produce that table. Before we say more about the loops, let's start reviewing from the beginning of the code.

With this line, all we are saying is that we want to create a HTML table. Note how the value for each of the table properties such as border, width, cellspacing, and cellpadding is enclosed by single quotation marks.

Recall that a table tag creates a table in HTML. We could have used a document. It is actually more efficient to use a variable for output instead of repeatedly calling the document.

So, in this example, each time we want to print something to the web page, we simply assign the output to the variable sout. Line 4 has our first for loop ; we could refer to this loop as an outer loop. It is an outer loop, as the name implies, because it inside contains a loop.

The loop inside an outer loop is called an inner loop, see line 6.

how to write a for loop in java

Let's now describe what is happening inside the loops, lines 4 through 8. The second time the inner loop executes, the second cell is created with the value 2; then the third cell is created with the value of 3, and so on.

When inner loop stops executing when j reaches 10, the first row is filled with 10 cells. Similarly, remaining rows and cells are created. We can also use a while loop to create nested loops. See the following code that produces the same output as you saw with the nested for loop:Enhanced for loop is useful when you want to iterate Array/Collections, it is easy to write and understand.

Let’s take the same example that we have written above and rewrite it using enhanced for loop. Repeats a statement or group of statements while a given condition is true.

It tests the condition before executing the loop body. 2: for loop. Execute a sequence of statements multiple times and abbreviates the code that manages the loop variable.

3: do while loop. Like a while statement, except that it tests the condition at the end of the loop body. We can use the simple for loop, for-each loop (advanced for loop) available from Java 5 onwards, iterator or ListIterator (though not a preferred way if we are just sequentially looping through the elements of a list) and from Java 8 using Java 8 forEach statement that works with stream.

Java 8: From a for-loop to forEach statement.

Simplest programming tutorials for beginners

NetBeans 8 converts ordinary for-loops into the functional notation by hitting the ALT+ENTER key on, or by clicking on the yellow bulb. See you at Java EE Workshops at MUC Airport or on demand and in a location very near you:! There are three loops nested at two level, first is for printing each line and inner loops for printing pattern in each line.

how to write a for loop in java

Java Program to Print Pyramid Pattern Here is our Java program to draw the pyramid pattern as shown in the problem statement. CodesDope: Learn loops in java. Learn about for, while, do while loops of Java.

Learn conditions of loop. Loop loop loop. Playing with loops makes programming fun. Before we try to understand loop, you should be thorough with all the previous topics of Java. There are other ways also to write a program of for loop.

Print out a Diamond : For Loop « Statement Control « Java Tutorial