Write a lambda or method reference for each of the following tasks:
a) Write a lambda expression that receives two doubl e parameters a and b and returns their product. Use the lambda form that explicitly lists the type of each parameter.
b) Rewrite the lambda expression in Part (a) using the lambda form that does not list the type of each parameter.
c) Rewrite the lambda expression in Part (b) using the lambda form that implicitly returns the value of the lambda's body expression.
d) Write a no-argument lambda that implicitly returns the string "Welcome to lambdas!".
e) Write a constructor reference for class ArrayList.
f) Reimplement the following statement using a lambda as the event handler:
button.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent event) { JOptionPane.showMessageDialog(ParentFrame.this, "JButton event handler"); } });
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