java数组随机

⑴ java怎么使用随机抽取数组里的数据

package reptile;

import java.util.Random;

public class Test
{

public static void main(String[] args){
String[] b = {"公共的", "私有的", "受保护的"};
Random rand = new Random();
int num = rand.nextInt(3);
System.out.println(b[num]);
}

⑵ java涓濡备綍闅忔満浜х敓涓涓鎸囧畾鏁扮粍涓镄勬暟

1銆佽幏鍙栨暟缁勯暱搴

intarr[]={1,2,3,4,5};//瀹氢箟涓涓鏁扮粍
		intlen=arr.length;//銮峰彇鏁扮粍闀垮害缁椤彉閲弆en

2銆佹牴鎹鏁扮粍闀垮害锛屼娇鐢≧andom闅忔満鏁扮粍镄勭储寮曞

Randomrandom=newRandom();//鍒涘缓闅忔満瀵硅薄
intarrIdx=random.nextInt(len-1);//闅忔満鏁扮粍绱㈠紩锛宯extInt(len-1)琛ㄧず闅忔満鏁存暟[0,(len-1)]涔嬮棿镄勫

3銆佹牴鎹闅忔満绱㈠紩銮峰彇鏁扮粍鍊

intnum=arr[arrIdx];//銮峰彇鏁扮粍鍊

⑶ Java缂栫▼,鍒涘缓涓涓浜岀淮鏁扮粍,闅忔満浜х敓 0∼100涔嬮棿镄勫,姹傚嚭链澶у煎强瀵瑰簲涓嬫爣

闇姹傦细Java缂栫▼,鍒涘缓涓涓浜岀淮鏁扮粍,闅忔満浜х敓 0锝100涔嬮棿镄勫,姹傚嚭链澶у煎强瀵瑰簲涓嬫爣銆

鍒嗘瀽姝ラわ细

A锛氩垱寤轰竴涓浜岀淮鏁扮粍

int[][] twoArr = new int[8][8];

B: 闅忔満浜х敓0~100涔嬮棿镄勫

Random random=new Random();

random.nextInt(100);

C:灏嗛殢链轰骇鐢熺殑鍊艰祴鍊肩粰鏁扮粍鍏幂礌

杩愮敤for寰鐜

D锛氭眰鍑烘渶澶у

锅囱総woArr[0][0]涓烘渶澶у硷纴阆嶅巻鏁扮粍锛屼袱涓ゆ瘆杈冿纴鎶婂煎ぇ镄勮祴鍊肩粰max銆傚悓镞舵爣璁皒,y

E:杈揿嚭链澶у硷纴杈揿嚭x,y锛堥亶铡嗙殑涓や釜灞閮ㄥ彉閲忥级鍊

importjava.util.Random;
classTwoArr{
	publicstaticvoidmain(String[]args){
		
		intn=8;//杩欓噷涔熷彲浠ユ敼鎴愰敭鐩桦綍鍏ョ殑褰㈠纺
		
		int[][]twoArr=newint[n][n];//瀹氢箟浜岀淮鏁扮粍
		
		//灏嗛殢链轰骇鐢熺殑鍊艰祴鍊肩粰鏁扮粍鍏幂礌
		for(intx=0;x<twoArr.length;x++){
			for(inty=0;y<twoArr[x].length;y++){
				Randomrandom=newRandom();
				twoArr[x][y]=random.nextInt(100);
			}
		}
		
		//姹傛渶澶у煎拰绱㈠紩
		intmax=twoArr[0][0];
		intindex1=0;
		intindex2=0;
		
		for(intx=1;x<twoArr.length;x++){
			for(inty=0;y<twoArr[x].length;y++){
				if(twoArr[x][y]>max){
					max=twoArr[x][y];
					index1=x;
					index2=y;
				}
			}
		}
		
		//杈揿嚭
		System.out.println("链澶у兼槸锛"+max+",鍏朵笅镙囦负锛歔"+index1+"]"+"["+index2+"]");
	}
}