Lambda: Supplier defers computation until get() is called

Creating a Supplier does not run its body; the lambda's work only happens the moment get() is invoked, which is what makes Supplier useful for lazy or repeatable computation.

Code

System.out.println("Before creating supplier");
Supplier<String> supplier = () -> {
    System.out.println("Computing now");
    return "result";
};
System.out.println("Supplier created, not yet computed");
System.out.println("Value: " + supplier.get());

Output

Before creating supplier
Supplier created, not yet computed
Computing now
Value: result