public BTNode getHead() { BTNode node1 = new BTNode(1); BTNode node2 = new BTNode(2); BTNode node3 = new BTNode(3); BTNode node4 = new BTNode(4); BTNode node5 = new BTNode(5); BTNode node6 = new BTNode(6); BTNode node7 = new BTNode(7); node1.leftNode = node2; node1.rightNode = node3; node2.leftNode = node4; node2.rightNode = node5; node3.leftNode = node6; node3.rightNode = node7; return node1; }