Examples of java.util.Vector.retainAll()

java.util.Vector.retainAll()
Retains only the elements in this Vector that are contained in the specified Collection. In other words, removes from this Vector all of its elements that are not contained in the specified Collection. @param c a collection of elements to be retained in this Vector(all other elements are removed) @return true if this Vector changed as a result of the call @throws ClassCastException if the types of one or more elementsin this vector are incompatible with the specified collection (optional) @throws NullPointerException if this vector contains one or more nullelements and the specified collection does not support null elements (optional), or if the specified collection is null @since 1.2

        // we need to clone because we don't want to modify the original
        // (we remove ourselves if LOCAL is false, see below) !
        //real_dests=dests != null ? (Vector) dests.clone() : (Vector) members.clone();
        if(dests != null) {
            real_dests=(Vector)dests.clone();
            real_dests.retainAll(this.members);
        }
        else {
            synchronized(members) {
                real_dests=new Vector(members);
            }

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        // we need to clone because we don't want to modify the original
        // (we remove ourselves if LOCAL is false, see below) !
        // real_dests=dests != null ? (Vector) dests.clone() : (members != null ? new Vector(members) : null);
        if(dests != null) {
            real_dests=(Vector)dests.clone();
            real_dests.retainAll(this.members);
        }
        else {
            synchronized(members) {
                real_dests=new Vector(members);
            }

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        // we need to clone because we don't want to modify the original
        // (we remove ourselves if LOCAL is false, see below) !
        // real_dests=dests != null ? (Vector) dests.clone() : (members != null ? new Vector(members) : null);
        if(dests != null) {
            real_dests=(Vector)dests.clone();
            real_dests.retainAll(this.members);
        }
        else {
            synchronized(members) {
                real_dests=new Vector(members);
            }

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        // we need to clone because we don't want to modify the original
        // (we remove ourselves if LOCAL is false, see below) !
        //real_dests=dests != null ? (Vector) dests.clone() : (Vector) members.clone();
        if(dests != null) {
            real_dests=(Vector)dests.clone();
            real_dests.retainAll(this.members);
        }
        else {
            synchronized(members) {
                real_dests=new Vector(members);
            }

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