blob: b3f6e0358e6a425a964ef654516c3be68b0ea4cc (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
import java.util.Arrays;
public class EqualsAndHashCodeExample {
private transient int transientVar = 10;
private String name;
private double score;
private Shape shape = new Square(5, 10);
private String[] tags;
private int id;
@Override public boolean equals(Object o) {
if (o == this) return true;
if (o == null) return false;
if (o.getClass() != this.getClass()) return false;
EqualsAndHashCodeExample other = (EqualsAndHashCodeExample) o;
if (name == null ? other.name != null : !name.equals(other.name)) return false;
if (Double.compare(score, other.score) != 0) return false;
if (!Arrays.deepEquals(tags, other.tags)) return false;
return true;
}
@Override public int hashCode() {
final int PRIME = 31;
int result = 1;
final long temp1 = Double.doubleToLongBits(score);
result = (result*PRIME) + (name == null ? 0 : name.hashCode());
result = (result*PRIME) + (int)(temp1 ^ (temp1 >>> 32));
result = (result*PRIME) + Arrays.deepHashCode(tags);
return result;
}
public static class Square extends Shape {
private final int width, height;
public Square(int width, int height) {
this.width = width;
this.height = height;
}
@Override public boolean equals(Object o) {
if (o == this) return true;
if (o == null) return false;
if (o.getClass() != this.getClass()) return false;
if (!super.equals(o)) return false;
Square other = (Square) o;
if (width != o.width) return false;
if (height != o.height) return false;
return true;
}
@Override public int hashCode() {
final int PRIME = 31;
int result = 1;
result = (result*PRIME) + super.hashCode();
result = (result*PRIME) + width;
result = (result*PRIME) + height;
return result;
}
}
}
|
