java Arrays

 

• binarySearch

• toString

• sort 排序

• asList  将数组转为只读List

public class ArraysDemo {
	
	public static void main(String[] args) {
		
		
		int [] data = {7,1,9,3,5};
		System.out.println(Arrays.toString(data));
		
		
		Arrays.sort(data);
		System.out.println(Arrays.toString(data));
		
 
		Integer otherData [] = {7,1,9,3,5};
		
		Arrays.sort(otherData,new Comparator<Integer>() {

			@Override
			public int compare(Integer o1, Integer o2) {
				return o2-o1;
			}
		});
		
		System.out.println(Arrays.toString(otherData));
		
		//将数组转成List[只读]
		List<Integer> result = Arrays.asList(1,2,3,4,5,6,7);
		System.out.println(result.getClass());
		System.out.println(result);
	}

}
 
class XX<T>{
	
}