for and while are the two Java looping construct. Here are some basic types of for and while loops.
class Loop {
public static void main(String[] args) {
// The most basic type, with a single condition.
Integer i = 1;
while(i <= 3){
System.out.println(i);
i = i + 1;
}
// A classic initial/condition/after `for` loop.
for(Integer j = 7; j <= 9; j++){
System.out.println(j);
}
// `while(true)` will loop repeatedly
// until you `break` out of the loop
// 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(Integer n = 0; n <= 5; n++) {
if(n%2 == 0){
continue;
}
System.out.println(n);
}
}
}
javac Loop.java
java Loop
# 1
# 2
# 3
# 7
# 8
# 9
# loop
# 1
# 3
# 5
We’ll see some other
forforms later when we look at:
foreachstatements (Foreach),
async channels (Async), and other data structures.
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