bridge 设计模式71、如何通过反射创建对象？方法1：(2)

private Singleton(){}

private static Singleton instance = new Singleton();

public static Singleton getInstance(){

return instance;

}

//懒汉

public class Singleton {

private static Singleton instance = null;

private Singleton() {}

public static synchronized Singleton getInstance(){

if (instance == null) instance ＝ new Singleton();

return instance;

}

}

76、二分查找

// 使用递归实现的二分查找

private static<T extends Comparable<T>> int binarySearch(T[] x, int low, int high, T key) {

if(low <= high) {

int mid = low + ((high -low) >> 1);

if(key.compareTo(x[mid])== 0) {

return mid;

}

else if(key.compareTo(x[mid])< 0) {

return binarySearch(x,low, mid - 1, key);

}

else {

return binarySearch(x,mid + 1, high, key);

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