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  1. class Example {
  2.     public static void main(String[] args) {
  3.         Thingy t = new Thingy.Builder()
  4.                     .withState1("one")
  5.                     .withState2("two")
  6.                     .withState3("three")
  7.                     .build();
  8.         System.out.println(t.getState());
  9.     }
  10. }
  11. class Thingy {
  12.     private String state;
  13.  
  14.     private Thingy(String s1, String s2, String s3) {
  15.         this.state = s1 + "/" + s2 + "/" + s3;
  16.     }
  17.  
  18.     public String getState() {
  19.         return this.state;
  20.     }
  21.  
  22.     public static class Builder {
  23.         private String state1 = null;
  24.         private String state2 = null;
  25.         private String state3 = null;
  26.  
  27.         public Builder withState1(String s1) {
  28.             this.state1 = s1;
  29.             return this;
  30.         }
  31.  
  32.         public Builder withState2(String s2) {
  33.             this.state2 = s2;
  34.             return this;
  35.         }
  36.  
  37.         public Builder withState3(String s3) {
  38.             this.state3 = s3;
  39.             return this;
  40.         }
  41.  
  42.         public Thingy build() {
  43.             if (this.state1 == null) {
  44.                 throw new IllegalStateException("state1 is required");
  45.             }
  46.             if (this.state2 == null) {
  47.                 throw new IllegalStateException("state2 is required");
  48.             }
  49.             if (this.state3 == null) {
  50.                 throw new IllegalStateException("state3 is required");
  51.             }
  52.             return new Thingy(this.state1, this.state2, this.state3);
  53.         }
  54.     }
  55. }
Success #stdin #stdout 0.1s 320512KB
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one/two/three
https://ideone.com/XRpYpf
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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