[JAVA] Duyệt cây theo 3 cách

//Cach 1 private void preOrder (Node t){ if(t!=null){ System.out.println(t.info+" "); preOrder(t.left); preOrder(t.right); } } public void preOrder (){ preOrder (r); } //Cach 2 private void inOrder (Node t){ if(t!=null){ inOrder(t.left); System.out.println(t.info+" "); inOrder(t.right); } } public void inOrder(){ inOrder(r); } //Cach 3 private void postOrder (Node t){ if(t!=null){ postOrder(t.left); postOrder(t.right); System.out.println(t.info+ " "); } } public void postOrder(){ postOrder(r); }