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Find maximum element of Java Vector

import java.util.Collections; import java.util.Vector; public class Main {   public static void main(String[] args) {     Vector<Double> v = new Vector<Double>();     v.add(new Double("3.4324"));     v.add(new Double("3.3532"));     v.add(new Double("3.342"));     v.add(new Double("3.349"));     v.add(new Double("2.3"));     Object obj = Collections.max(v);     System.out.println(obj);   } } //3.4324