How to use the chain builder mode

This article introduces the relevant knowledge of "how to use the chain builder model". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

The chain builder pattern is not often used in practical work, and it is very helpful for the construction of complex objects.

Public class Computer {private final String cpu; private final String ram; private final String display; private Computer (Builder builder) {this.cpu = builder.cpu; this.ram = builder.ram; this.display = builder.display;} public static class Builder {private String cpu; private String ram; private String display; public Builder (String cup, String ram) {this.cpu = cup This.ram = ram;} public Builder setDisplay (String display) {this.display = display; return this;} public Computer build () {return new Computer (this);} public static void main (String [] args) {new Computer.Builder ("cup1", "ram2"). SetDisplay ("display3"). Build () }

It is important to note that the constructor of Computer is private, and Builder uses static inner classes.

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