altoslib/altosuilib: Fix equals methods, add hashCode

Whenever we use a class as a HashMap key, that class needs to override
the equals(Object) and hashCode() methods. Otherwise, the hash table
won't work right.

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/altoslib/AltosFrequency.java b/altoslib/AltosFrequency.java
index 15ace0c2..6d42fd69 100644
--- a/altoslib/AltosFrequency.java
+++ b/altoslib/AltosFrequency.java
@@ -21,6 +21,19 @@ public class AltosFrequency {
 	public double	frequency;
 	public String	description;
 
+	public int hashCode() {
+		return new Double(frequency).hashCode();
+	}
+
+	public boolean equals(Object o) {
+		if (o == null)
+			return false;
+		if (!(o instanceof AltosFrequency))
+			return false;
+		AltosFrequency other = (AltosFrequency) o;
+		return other.frequency == frequency;
+	}
+
 	public String toString() {
 		return String.format("%7.3f MHz %-20s",
 				     frequency, description);