JDK 1.5 Generic - Vector Problem
Hi,
I need some advice on JDK 1.5 Generic. Please don't mind what this code is all about. The problem is on the compilation part on JDK 1.5.
1 public class VectorExample {
2
3private java.util.Vector<Object> rows = new java.util.Vector<Object>();
4
5public VectorExample() {
6}
7
8public void initVector(java.sql.ResultSet resultSet) {
9 java.util.Vector<Object> newRow = new java.util.Vector<Object>();
10 try {
11 for (int index = 1; index <= 10; index++) {
12newRow.addElement(resultSet.getObject(index));
13 }
14 rows.addElement(newRow);
15 } catch(java.sql.SQLException e) {
16
17 }
18}
19
20public Object getObject(int rowIndex, int columnIndex) {
21 java.util.Vector<Object> row = (java.util.Vector<Object>)rows.elementAt(rowIndex);
22 return row.elementAt(columnIndex);
23}
24 }
On compilation it gives the follwing warning message,
Note: VectorExample.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
The problem is at the line number 21. I tried
java.util.Vector<Object> row = (java.util.Vector)rows.elementAt(rowIndex);
Same warning message.
Please help me out to solve the type cast problem in JDK 1.5.
The line
java.util.Vector<Object> row = (java.util.Vector<Object>)rows.elementAt(
rowIndex);
is giving message as unchecked cast,
C:\jdk1.5.0\bin>javac -Xlint:unchecked VectorExample.java
VectorExample.java:21: warning: [unchecked] unchecked cast
found: java.lang.Object
required: java.util.Vector<java.lang.Object>
java.util.Vector<Object> row = (java.util.Vector<Object>)rows.elementAt(
rowIndex);
1 warning
And the line
java.util.Vector<Object> row = (java.util.Vector)rows.elementAt(
rowIndex);
is giving message as unchecked conversion,
C:\jdk1.5.0\bin>javac -Xlint:unchecked VectorExample.java
VectorExample.java:21: warning: [unchecked] unchecked conversion
found: java.util.Vector
required: java.util.Vector<java.lang.Object>
java.util.Vector<Object> row = (java.util.Vector)rows.elementAt(rowIndex
);
1 warning
