Block / Closures: Java, C#, Ruby

Java version

public EmployeeList managers(EmployeeList emps) {
 return emps.findAll(
   new EmployeeFinder() {
     boolean find(Employee emp) { return e.isManager; }
   }
 );
}
// Supporting EmployeeList class and EmployeeFinder interface required

C# 2.0 finder (Less verbose than Java and no supporting classes)

public List Managers(List emps) {
 return emps.FindAll(delegate(Employee e) { return e.IsManager; } );
}

Ruby finder

def managers(emps)
 return emps.select {|e| e.isManager}
end 

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C# 2.0 

int total = 0;
order.EachItem(delegate(Item item) {
total += item.Price;
}

Java

final int[] total = { 0 };
order.eachItem(new OrderBlock() {
public void handle(Item item) {
total[0] += item.getPrice();
}
});