本文介绍了在java中随机使用字符串?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我试图随机选择4个字符串中的字符串,并在控制台上显示该字符串。我该怎么做 ?例如,有一个问题,如果用户正确回答,那么控制台将显示我选择的一个字符串。我知道如何随机选择一个整数值,但我无法弄清楚如何随机选择一个字符串。请帮忙?
I am trying to choose a string out of 4 strings randomly, and to show this string on the console. How can i do it ? For example, there is a question, if user answers it correctly, then the console will display one of the strings that i chose. I know how to choose an integer value randomly, but i could not figure out how to choose a string randomly. Please Help?
推荐答案
import java.util.Random;
public class RandomSelect {
public static void main (String [] args) {
String [] arr = {"A", "B", "C", "D"};
Random random = new Random();
// randomly selects an index from the arr
int select = random.nextInt(arr.length);
// prints out the value at the randomly selected index
System.out.println("Random String selected: " + arr[select]);
}
}
使用charAt:
import java.util.Random;
public class RandomSelect {
public static void main (String [] args) {
String text = "Hello World";
Random random = new Random();
// randomly selects an index from the arr
int select = random.nextInt(text.length());
// prints out the value at the randomly selected index
System.out.println("Random char selected: " + text.charAt(select));
}
}
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