Problem with Warning message

Question

I use TableSorter from java web and when I run it gave me these warning. How can I fix this thank heaps.
C:\Project>javac -Xlint *.java
TableSorter.java:76: warning: [unchecked] unchecked call to compareTo(T) as a member of the raw type java.lang.Comparable
return ((Comparable) o1).compareTo(o2);
^
TableSorter.java:185: warning: [unchecked] unchecked call to add(E) as a member of the raw type java.util.List
sortingColumns.add(new Directive(column, status));
^
TableSorter.java:207: warning: [unchecked] unchecked call to put(K,V) as a member of the raw type java.util.Map
columnComparators.put(type, comparator);
^
TableSorter.java:312: warning: [unchecked] unchecked call to compare(T,T) as a member of the raw type java.util.Comparator
comparison = getComparator(column).compare(o1, o2);
^
4 warnings
Appreciate
Love

Answer 1

I am still relatively new to java and have a similar issue. I wanted to leverage Vector to create a self-sorting list (imposing a specific object type in the process).
public class FooList extends Vector {
    public boolean add(FooNode node){
        boolean result = true;
        int iInsertionPoint = 0, iListLength = 0;
        iListLength = this.size();
        switch(MyIndexType){
            case IndexByDouble:
                iInsertionPoint = find(node.lfKey);
                break;
            case IndexByLongInt:
                iInsertionPoint = find(node.iKey);
                break;
            case IndexByString:
                iInsertionPoint = find(node.sKey);
                break;
            default:
                result = false;
        } // switch
        if(iInsertionPoint >= iListLength)
            addElement(node);
        else
            add(iInsertionPoint, node);
        return result;
    } // FooList.add()
} // class FooListthe two add calls are methods inherited from Vector and produce the following warnings:
Compiling 1 source file to ...\build\classes
...\util\FooList.java:75: warning: [unchecked] unchecked call to addElement(E) as a member of the raw type java.util.Vector
            addElement(node);
...\util\FooList.java:77: warning: [unchecked] unchecked call to add(int,E) as a member of the raw type java.util.Vector
            add(iInsertionPoint, node);
2 warningsEspecially with my novice status, I really dislike warnings. Can anyone provide any suggestions on how to do this better or at least eliminate the warnings?