Foreach loops

Java für Fortgeschrittene

Jim White

Java Developer

foreach

Allows iterating through things like arrays without managing indexes
Useful when we don't need to know where the value is

Spiral arrow

foreach syntax

String[] names = {"Ada", "Ivo", "Ti"}

for (String name: names){
  System.out.println(name);
}

Ada
Ivo
Ti

name: temporary variable, needs to have a type
names: array (or generally an iterable)

On each iteration, Java automatically gives us the next element of the iterable

For each name in names, do something

for each loop

Pros

Improves readability over normal for loop
Removes extra setup

Better for:
- Working with values as they are
  - E.g., printing the values

Cons

Not working with indexes
Can only use the value we get

Bad for:
- Changing values
- Keeping track of position

Let's practice!

Java für Fortgeschrittene

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