Algorithms 1 Union-find with specific canonical element

TestRunner2.java

public class Canonical {
    private int members[];

    public void setMembers(int members[]) {
        this.members = members;
    }

    private int findRoot(int memberId) {
        boolean foundRoot = false;
        int rootId = memberId;
        while(!foundRoot) {
            int newId = this.members[rootId];
            if(newId == this.members[newId]) {
                foundRoot = true;
            } 
            rootId = newId;
        }
        return rootId;
    }

    public void union(int memberId, int memberIdToUnion) {
        int rootMemberId = findRoot(memberId);
        int rootMemberIdToUnion = findRoot(memberIdToUnion);
        if(rootMemberId >= rootMemberIdToUnion) {
            this.members[rootMemberIdToUnion] = rootMemberId;
        } else {
            this.members[rootMemberId] = rootMemberIdToUnion;
        }
    }

    public boolean connected(int memberId, int memberIdToCheck) {
        int rootMemberId = findRoot(memberId);
        int rootMemberIdToCheck = findRoot(memberIdToCheck);
        return rootMemberId == rootMemberIdToCheck;
    }

    public int find(int memberId) {
        return findRoot(memberId);
    }
}

public class TestRunner2 {
    public static void main(String[] args) {
        Canonical percolation = new Canonical();
        percolation.setMembers(new int[]{ 0,1,2,3,4,5,6,7,8,9,10 });
        percolation.union(3,6);
        percolation.union(5,7);
        percolation.union(1,10);
        percolation.union(6,5);
        percolation.union(1,7);
        percolation.union(2,8);
        System.out.println(percolation.connected(6,3));
        System.out.println(percolation.connected(0,3));
        System.out.println(percolation.find(7));
        System.out.println(percolation.find(0));
    }
}

thanks for your attribution