public class Node {
public Node(String value) {
this.value = value;
}
public Node leftNode;//
public Node rightNode;//
public String value;//
public static void read(Node node) {
if (node == null) {
return;
}
System.out.print(node.value);// （print ， ， read ）
read(node.leftNode);
read(node.rightNode);
}
public static void main(String[] args) {
Node node1 = new Node("A");
Node node2 = new Node("B");
Node node3 = new Node("C");
Node node4 = new Node("D");
Node node5 = new Node("E");
Node node6 = new Node("F");
node1.leftNode = (node2);
node1.rightNode = (node3);
node2.leftNode = (node4);
node3.leftNode = (node5);
node3.rightNode = (node6);
read(node1);
}
}