面向对象

package diqiu;

import static java.lang.Math.*;

public class Jt {
	public static void main(String[] args) {
		double y=sqrt(4);
		System.out.println(y);
	}
}

package diqiu;

import java.util.Arrays;

public class Xxxx {
	public static void main(String[] args) {
		int[] y=new int[] {1,4,7,13,5,17,9};
		Arrays.sort(y);
		for(int i:y){
			System.out.print(i+" ");
		}
	}
}

package diqiu;

public class Aa {
	public static void main(String[] args) {
		int[] ins=new int[]{1,2,4,5};
		System.out.println(add(ins));
	}
	public static int add(int...xyz){
		int sum=0;
		for(int i=0;i<xyz.length;i++){
			sum+=xyz[i];
		}
		return sum;
	}
}