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TreeTraversalsExample.java

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package ch14;

public class TreeTraversalsExample {

static class TNode {

char val;

TNode left;

TNode right;

public TNode(char val) {

this.val = val;

}

public TNode(char val, TNode left, TNode right) {

this.val = val;

this.left = left;

this.right = right;

}

}

public static void preorder(TNode node) {

if (node == null)

return;

System.out.printf("%c ", node.val);

preorder(node.left);

preorder(node.right);

}

public static void inorder(TNode node) {

if (node == null)

return;

inorder(node.left);

System.out.printf("%c ", node.val);

inorder(node.right);

}

public static void postorder(TNode node) {

if (node == null)

return;

postorder(node.left);

postorder(node.right);

System.out.printf("%c ", node.val);

}

public static void main(String[] args) {

// 그림 14-26 예제 트리 생성

TNode root = new TNode('F',

new TNode('B',

new TNode('A'),

new TNode('D',

new TNode('C'), new TNode('E'))

),

new TNode('G',

null,

new TNode('I',

new TNode('H'), null))

);

// 전위 순회

preorder(root);

System.out.println();

// 중위 순회

inorder(root);

System.out.println();

// 후위 순회

postorder(root);

System.out.println();

}

}