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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6. import java.util.function.Function;
  7.  
  8. class A{
  9.     private final int x;
  10.  
  11.     private A(int x) {
  12.         this.x=x;
  13.     }
  14.  
  15.     public int getX() { return x; }
  16.  
  17.     public static A build(Function<Builder, Builder> builderFiller) {
  18.         Builder builder = new Builder();
  19.         builder = builderFiller.apply(builder);
  20.         return builder.build();
  21.     }
  22.  
  23.     public static class Builder{
  24.         private int x;
  25.  
  26.         private Builder() {}
  27.  
  28.         public Builder withX(int value){
  29.             this.x = value;
  30.             return this;
  31.         }
  32.  
  33.         private A build(){
  34.             return new A(x);
  35.         }
  36.     }
  37. }
  38.  
  39. /* Name of the class has to be "Main" only if the class is public. */
  40. class Ideone
  41. {
  42. 	public static void main (String[] args) throws java.lang.Exception
  43. 	{
  44. 		A a = A.build(builder -> builder.withX(11));
  45. 		System.out.println(a.getX());
  46. 	}
  47. }
Success #stdin #stdout 0.07s 47992KB
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11
https://ideone.com/Gufnwr
language:
Java (HotSpot 12)
created:
3 years ago
visibility:
public

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