For

for

Here’s the translation of the Go code example and explanation into Java, formatted in Markdown suitable for Hugo:

public class ForLoops {
    public static void main(String[] args) {
        // The most basic type, with a single condition.
        int i = 1;
        while (i <= 3) {
            System.out.println(i);
            i = i + 1;
        }

        // A classic initial/condition/after for loop.
        for (int j = 0; j < 3; j++) {
            System.out.println(j);
        }

        // Java doesn't have a direct equivalent to Go's `range` over integers,
        // but we can use a traditional for loop to achieve the same result.
        for (int k = 0; k < 3; k++) {
            System.out.println("range " + k);
        }

        // An infinite loop that will run until you break out of it or return
        // from the enclosing function.
        while (true) {
            System.out.println("loop");
            break;
        }

        // You can also continue to the next iteration of the loop.
        for (int n = 0; n < 6; n++) {
            if (n % 2 == 0) {
                continue;
            }
            System.out.println(n);
        }
    }
}

for loops are one of Java’s fundamental looping constructs. Here are some basic types of loops in Java.

The most basic type is a while loop with a single condition:

int i = 1;
while (i <= 3) {
    System.out.println(i);
    i = i + 1;
}

A classic initial/condition/after for loop:

for (int j = 0; j < 3; j++) {
    System.out.println(j);
}

Java doesn’t have a direct equivalent to Go’s range over integers, but we can use a traditional for loop to achieve the same result:

for (int k = 0; k < 3; k++) {
    System.out.println("range " + k);
}

An infinite loop that will run until you break out of it or return from the enclosing function:

while (true) {
    System.out.println("loop");
    break;
}

You can also use continue to skip to the next iteration of the loop:

for (int n = 0; n < 6; n++) {
    if (n % 2 == 0) {
        continue;
    }
    System.out.println(n);
}

To run the program:

$ javac ForLoops.java
$ java ForLoops
1
2
3
0
1
2
range 0
range 1
range 2
loop
1
3
5

We’ll see other loop forms later when we look at enhanced for loops (for-each loops), which are similar to Go’s range statements for iterating over collections and arrays.

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For

for