（String num:tmp）=>for（a:b）意味着什么？[重复]

Question

我不明白Java中for（String a： b）是什么意思，希望有人能解释一下是什么意思。

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int n = Integer.parseInt(br.readLine());
        int count = 0;
        for (int i = 0; i < n; i++) {
            String[] tmp = br.readLine().split(" ");
            int sum = 0;
            // **I don't understand num: tmp means what.**
            for (String num : tmp) {
                sum += Integer.parseInt(num);
            }
            sum = sum / 3;
            if(sum < 60){
                count++;
            }
        } 
        System.out.println(count);
    }
}

Answer 1

它是增强的for循环：

for (String num : tmp) {
    sum += Integer.parseInt(num);
}

就像

for(int i=0;i<tmp.length:i++){
    String num=tmp[i];
    sum += Integer.parseInt(num);
}