/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
 
class Aluno {
   private String nome;
   private float rg;
   private int idade;
 
   public Aluno(String nome, float rg, int idade) {
      this.nome = nome;
      this.rg = rg;
      this.idade = idade;
   }
 
   @Override
   public boolean equals(Object o) {
      boolean result = false;
      if (this.getRg() == ((Aluno)o).getRg()) {
         result = true;
      }
      return result;
   }   
 
   public float getRg() {
   	 return this.rg;
   }
}
 
class Ideone
{
	public static void main (String[] args)
	{
      Aluno a1 = new Aluno("A", 12, 20);
      Aluno a2 = new Aluno("B", 11, 25);
      Aluno a3 = new Aluno("A", 25, 28);
      Aluno a4 = new Aluno("D", 12, 21);
      System.out.println(a1.equals(a3)); // aqui retorna false
      System.out.println(a1.equals(a4)); // aqui retorna true
	}
}

LyogcGFja2FnZSB3aGF0ZXZlcjsgLy8gZG9uJ3QgcGxhY2UgcGFja2FnZSBuYW1lISAqLwoKaW1wb3J0IGphdmEudXRpbC4qOwppbXBvcnQgamF2YS5sYW5nLio7CmltcG9ydCBqYXZhLmlvLio7CgovKiBOYW1lIG9mIHRoZSBjbGFzcyBoYXMgdG8gYmUgIk1haW4iIG9ubHkgaWYgdGhlIGNsYXNzIGlzIHB1YmxpYy4gKi8KCmNsYXNzIEFsdW5vIHsKICAgcHJpdmF0ZSBTdHJpbmcgbm9tZTsKICAgcHJpdmF0ZSBmbG9hdCByZzsKICAgcHJpdmF0ZSBpbnQgaWRhZGU7CgogICBwdWJsaWMgQWx1bm8oU3RyaW5nIG5vbWUsIGZsb2F0IHJnLCBpbnQgaWRhZGUpIHsKICAgICAgdGhpcy5ub21lID0gbm9tZTsKICAgICAgdGhpcy5yZyA9IHJnOwogICAgICB0aGlzLmlkYWRlID0gaWRhZGU7CiAgIH0KCiAgIEBPdmVycmlkZQogICBwdWJsaWMgYm9vbGVhbiBlcXVhbHMoT2JqZWN0IG8pIHsKICAgICAgYm9vbGVhbiByZXN1bHQgPSBmYWxzZTsKICAgICAgaWYgKHRoaXMuZ2V0UmcoKSA9PSAoKEFsdW5vKW8pLmdldFJnKCkpIHsKICAgICAgICAgcmVzdWx0ID0gdHJ1ZTsKICAgICAgfQogICAgICByZXR1cm4gcmVzdWx0OwogICB9ICAgCgogICBwdWJsaWMgZmxvYXQgZ2V0UmcoKSB7CiAgIAkgcmV0dXJuIHRoaXMucmc7CiAgIH0KfQoKY2xhc3MgSWRlb25lCnsKCXB1YmxpYyBzdGF0aWMgdm9pZCBtYWluIChTdHJpbmdbXSBhcmdzKQoJewogICAgICBBbHVubyBhMSA9IG5ldyBBbHVubygiQSIsIDEyLCAyMCk7CiAgICAgIEFsdW5vIGEyID0gbmV3IEFsdW5vKCJCIiwgMTEsIDI1KTsKICAgICAgQWx1bm8gYTMgPSBuZXcgQWx1bm8oIkEiLCAyNSwgMjgpOwogICAgICBBbHVubyBhNCA9IG5ldyBBbHVubygiRCIsIDEyLCAyMSk7CiAgICAgIFN5c3RlbS5vdXQucHJpbnRsbihhMS5lcXVhbHMoYTMpKTsgLy8gYXF1aSByZXRvcm5hIGZhbHNlCiAgICAgIFN5c3RlbS5vdXQucHJpbnRsbihhMS5lcXVhbHMoYTQpKTsgLy8gYXF1aSByZXRvcm5hIHRydWUKCX0KfQ==