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Assume you have the following definition of class A: public class A { private int x; private String s; public A( int a, String b) { X = a; s = b; } } And the following fragment of code: String s1 = "Hello"; %3D A a1 = new A(10, s1); A a2 = new A(10, s1); A a3 = new A(20, s1); Which of the comparisons using equals is true? a2.equals(a3) O a1.equals(a3) O a1.equals(a2) O None of the above.

Assume you have the following definition of class A: public class A { private int x; private String s; public A( int a, String b) { X = a; s = b; } } And the following fragment of code: String s1 = "Hello"; %3D A a1 = new A(10, s1); A a2 = new A(10, s1); A a3 = new A(20, s1); Which of the comparisons using equals is true? a2.equals(a3) O a1.equals(a3) O a1.equals(a2) O None of the above.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Assume you have the following definition of class A: public class A { private int x; private String s; public A( int a, String b) { x = a; s = b; } } And the following fragment of code: String s1 = "Hello"; A а1 = new A(10, s1); А а2 = new A(10, s1); A a3 = new A(20, s1); Which of the comparisons using equals is true? a2.equals(a3) a1.equals(a3) a1.equals(a2) None of the above.
Transcribed Image Text:Assume you have the following definition of class A: public class A { private int x; private String s; public A( int a, String b) { x = a; s = b; } } And the following fragment of code: String s1 = "Hello"; A а1 = new A(10, s1); А а2 = new A(10, s1); A a3 = new A(20, s1); Which of the comparisons using equals is true? a2.equals(a3) a1.equals(a3) a1.equals(a2) None of the above.
Assume you have the following definition of class A: public class A { private int x; private String s; public A( int a, String b) { X = a; s = b; } public boolean equals( Object o ) { if( o instanceof A ) { A a = (A)o; return this.x: } else return false; } %3D == a.x && this.s == a.s; } And the following fragment of code: String s1 = "Hello"; %D A а1 = new A(10, s1); А а2 = new A(10, s1); А а3 = new A(20, s1); Which of the comparisons using equals is true? a1.equals(a3) ) a1.equals(a2) None of the above a2.equals(a3)
Transcribed Image Text:Assume you have the following definition of class A: public class A { private int x; private String s; public A( int a, String b) { X = a; s = b; } public boolean equals( Object o ) { if( o instanceof A ) { A a = (A)o; return this.x: } else return false; } %3D == a.x && this.s == a.s; } And the following fragment of code: String s1 = "Hello"; %D A а1 = new A(10, s1); А а2 = new A(10, s1); А а3 = new A(20, s1); Which of the comparisons using equals is true? a1.equals(a3) ) a1.equals(a2) None of the above a2.equals(a3)
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