java:如何获取字符串内某一个字符出现的次数

import java.util.Arrays;
import java.util.Collections;

public class test {

    public static void main(String[] args) {
        String temp = "0001111111010010101010001011101111010";
        String target = "1";
        int count = Collections.frequency(Arrays.asList(temp.split("")), target);
        System.out.println(count);
    }
}

执行结果如下：