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In Java, there are three main types of loops:

for loop: Used when the number of iterations is known in advance.

// Classic for loop for iterating over a range of numbers
for (int i = 0; i < 10; i++) {
    System.out.println(i);
}

There is also the enhanced for loop (for-each), which is convenient for iterating over collections and arrays.

// Enhanced for loop for iterating over an array
String[] names = {"Alice", "Bob"};
for (String name : names) {
    System.out.println(name);
}

while loop: Used when the number of iterations is not known in advance, and the condition is checked before each iteration.
```
// while loop
int count = 0;
while (count < 5) {
    System.out.println("Iteration: " + count);
    count++;
}
```
do-while loop: Similar to while, but the condition is checked after executing the loop body, ensuring at least one iteration.
```
// do-while loop
int num = 5;
do {
    System.out.println("Number: " + num);
    num--;
} while (num > 0);
```

Additionally, there are break and continue statements to control the flow of loops.