Interchange names in odd places in an array to even places

public class InterchangeOddPlacesNamesToEven
{
    String t;
    void input(String a[])
    {
        int i,l=a.length;
        for(i=0;i<l;i++)
        {
            System.out.print(a[i]+" ");
        }
        System.out.println("\nAfter Arranging");
        for(i=0;i<l;i+=2)
        {
            t=a[i];
            a[i]=a[i+1];
            a[i+1]=t;
        }
        for(i=0;i<l;i++)
        {
            System.out.print(a[i]+" ");
        }
    }
}