Java编码风格更加简洁

Question

如何在不创建其他对象的情况下用Java压缩这些代码？

myObjectNumberOne.setTitle("title");
myObjectNumberOne.setBody("body");
myObjectNumberOne.setAutostart(true);
myObjectNumberOne.mySubObject1.setProp1("prop1");
myObjectNumberOne.mySubObject1.setProp2("prop2");
myObjectNumberOne.setFooter("footer");

和其他语言一样

with (myObjectNumberOne) {
  setTitle("title");
  setBody("body");
  setAutostart(true);
  with (mySubObject1) {
    setProp1("prop1");
    setProp2("prop2");
  }
  setFooter("footer");    
}

无需修改任何类或使用任何模式（生成器或构造函数）。我的意思是为了写更少的代码

Answer 1

也许可以为mySubObject创建多个构造函数

 public MySubObject(String prop1){
     this.prop1 = prop1;
 }

 public MySubObject(String prop1, String prop2){
     this.prop1 = prop1;
     this.prop2 = prop2;
 }
 .
 .
 .

然后你可以替换

  with (mySubObject1) {
    setProp1("prop1");
    setProp2("prop2");
  }

用类似的东西：

with (myObjectNumberOne) {
  setTitle("title");
  setBody("body");
  setAutostart(true);
  setMySubObject(new MySubObject("prop1", "prop2"));
  setFooter("footer");    
}

您还可以签出varargs：https://www.baeldung.com/java-varargs

Answer 2

在类中创建一个内部类并将其命名为Builder以下是一个简单的示例：

public class Car {

    private  String name;
    private int minSpeed;
    private int maxSpeed;
    private int mileAge;
    private String owner;


    public String getName(){
        return name;
    }
    public String getOwner(){
        return owner;
    }


    public int getMaxSpeed(){
        return maxSpeed;
    }
    public int getMinSpeed(){
        return minSpeed;
    }
    public int getMileAge(){
        return mileAge;
    }

    public static CarBuilder create(){
        return new Car().new CarBuilder();
    }

    public class CarBuilder {
        public CarBuilder setName(String name){
            Car.this.name = name;
            return this;
        }

        public CarBuilder setOwner(String owner){
            Car.this.owner = owner;
            return this;
        }

        public CarBuilder setMileAge(int mileAge){
            Car.this.mileAge = mileAge;
            return this;
        }

        public Car build(){
            return Car.this;
        }


    }


}

然后你可以使用它：

Car car = Car.create()
.setName("Audi")
.setMileAge(200)
.setOwner("John")
.build();

Answer 3

让所有设置器返回对象本身。例如：

MyObject setTitle(String s){
    this.title = s;
    return this;
}

这里我假设您的类名为MyObject。在对所有其他方法也执行此操作后，请改为执行此操作：

myObjectNumberOne.setTitle("title")
.setBody("body")
.setAutostart(true)
.mySubObject1.setProp1("prop1")
.mySubObject1.setProp2("prop2")
.setFooter("footer");

编辑：这叫做方法链接。