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饿汉式
class Singleton {
private static Singleton instance=new Singleton();
private Singleton(){}
static Singleton getInstance() {
return instance;
}
}
懒汉式
class Singleton {
private static Singleton instance=null;
private Singleton(){}
static Singleton getInstance() {
if(instan ...
Binary.java
import java.util.Stack;
public class BinaryTree {
protected Node root;
public BinaryTree(Node root) {
this.root = root;
}
public Node getRoot() {
return root;
}
/** 构造树 */
public static Node init() {
Node a = new Node('A');
Node b = new Node('B', null, a);
Node c = ne ...