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--- courses:mapreduce-tutorial:step-27 [2012/01/28 18:46]
straka
+++ courses:mapreduce-tutorial:step-27 [2012/01/28 18:55]
straka
@@ Line 55: / Line 55: @@
 ===== PairWritable<A, B> =====
-As another example, we implement a type storing two user-defined ''Writable'' implementations:
+As another example, we implement a type consisting of two user-defined ''Writable'' implementations:
+<code java>
+public static class PairWritable<A extends Writable, B extends Writable > implements Writable {
+  private A first;
+  private B second;
+  public void readFields(DataInput in) throws IOException {
+    first.readFields(in);
+    second.readFields(in);
+  }
+  public void write(DataOutput out) throws IOException {
+    first.write(out);
+    second.write(out);
+  }
+  public A getFirst() { return first; }
+  public B getSecond() { return second; }
+  public void setFirst(A first) { this.first = first; }
+  public void setSecond(B first) { this.second = second; }
+  public PairWritable(A first, B second) { this.first = first; this.second = second; }
+}
+</code>

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