Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Question 2
Analyze the following code.
// Program 1
public class Test{
public static void main(String[] args) {
Object al = new A0);
Object a 2 = new A0);
System.out.println(((A)a 1).equals((A)a 2));
}
}
class A {
int x;
public boolean equals(A a) {
return this.x == a.x;
}
}
// Program 2
public class Test{
public static void main(String[] args) {
A a1 = new A();
A a2 = new A0);
System.out.println(a1.equals(a2));
}
}
class A {
int x;
public boolean equals(A a) {
return this.x == a.x;
}
}
Program 1 displays true and Program 2 displays true
Program 1 displays false and Program 2 displays true
O Program 1 displays true and Program 2 displays false
Program 1 displays false and Program 2 displays false
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Transcribed Image Text:Question 2 Analyze the following code. // Program 1 public class Test{ public static void main(String[] args) { Object al = new A0); Object a 2 = new A0); System.out.println(((A)a 1).equals((A)a 2)); } } class A { int x; public boolean equals(A a) { return this.x == a.x; } } // Program 2 public class Test{ public static void main(String[] args) { A a1 = new A(); A a2 = new A0); System.out.println(a1.equals(a2)); } } class A { int x; public boolean equals(A a) { return this.x == a.x; } } Program 1 displays true and Program 2 displays true Program 1 displays false and Program 2 displays true O Program 1 displays true and Program 2 displays false Program 1 displays false and Program 2 displays false
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