28-pair-Book_Management_System.md

git commit --author="Herbie Husker and Lil Red <hhusker20lred19@dev.null>"
def __init__(self, one=1, two=2.0):
    self.one = one
    self.two = two
public Foo() { this(1, 2.0); } // calls another constructor using default values
public Foo(int one) { this(one, 2.0); }
public Foo(double two) { this(1, two); }
public Foo(int one, double two) { this.one = one; this.two = two; }
public Foo(int one) { this(one, 2); }   // even if the compiler allowed this,
public Foo(int two) { this(1, two); }   // which is called for "Foo(5)"?
public class FooBuilder {
    private int one;
    private int two;

    public FooBuilder() {
        this.one = 1;
        this.two = 2;
    }

    public FooBuilder setOne(int one) {
        this.one = one;
        return this;
    }

    public FooBuilder setTwo(int two) {
        this.two = two;
        return this;
    }

    public Foo build() {
        return new ConcreteFoo(this.one, this.two);
    }

    /** The Foo implementation doesn't have to be an inner class,
        but it could be */
    private class ConcreteFoo {
        ConcreteFoo(int one, int two) {...}
        ...
    }
}
Foo foo1 = new FooBuilder().build();            // uses default values
Foo foo2 = new FooBuilder().setOne(5).build();  // overrides default "one"
Foo foo3 = new FooBuilder().setTwo(9).build();  // overrides default "two"
Foo foo4 = new FooBuilder().setOne(7).setTwo(12).build(); // overrides both
git checkout staging
git merge your_development_branch
git checkout master
git merge staging