Dajianganya的专栏

package Thread;public class MyThread implements Runnable{ protected int countDown = 10; private static int taskCount = 0; private final int id = taskCount++; public MyThread(){} public

package JUC;/** * Causes the current thread to wait until either another thread invokes the * {@link java.lang.Object#notify()} method or the * {@link java.lang.Object#notifyAll()} method for t

String StringBuffer 性能比较

public class Heap { /** * 根据给定的数组以及 数组的取值范围 lastIndex 构造大顶堆； * 步骤： * 1.从最后一个非叶子节点((lastIndex-1)/2)开始往上遍历所有的非叶子节点((lastIndx-1)/2,.....,0) * 2.对于每一个非叶子节点K * 2.1 判断是否含有孩子节点，并找到比K节点值大的最大