builder模式

builder模式.md

http://www.cnblogs.com/moonz-wu/archive/2011/01/11/1932473.html

public class DoDoContact { private final int age; private final int safeID; private final String name; private final String address;

public int getAge() {
    return age;
}

public int getSafeID() {
    return safeID;
}

public String getName() {
    return name;
}

public String getAddress() {
    return address;
}

public static class Builder {
    private int    age     = 0;
    private int    safeID  = 0;
    private String name    = null;
    private String address = null;

　　　 // 构建的步骤 public Builder(String name) { this.name = name; }

    public Builder age(int val) {
        age = val;
        return this;
    }

    public Builder safeID(int val) {
        safeID = val;
        return this;
    }

    public Builder address(String val) {
        address = val;
        return this;
    }

    public DoDoContact build() { // 构建，返回一个新对象
        return new DoDoContact(this);
    }
}

private DoDoContact(Builder b) {
    age = b.age;
    safeID = b.safeID;
    name = b.name;
    address = b.address;

}

}

DoDoContact ddc = new DoDoContact.Builder("Ace").age(10) .address("beijing").build(); System.out.println("name=" + ddc.getName() + "age =" + ddc.getAge() + "address" + ddc.getAddress());