如何使用for循环从数组的每个第n个元素进行循环?
问题描述:
我想从答案数组中的每个第四个元素循环,并且我的代码不工作。如何使用for循环从数组的每个第n个元素进行循环?
这是输出我需要:
Question 1
Answer 1
Answer 2
Answer 3
Answer 4
Question2
Answer A
Answer B
Answer C
Answer D
这是我得到的输出:
Question 1
Answer 1
Answer 2
Answer 3
Answer 4
Question 2
Answer 1
Answer 2
Answer 3
Answer 4
这是我写的代码:
String[]question = new String[2];
question[0] = "Question 1";
question[2] = "Question 2";
String[]answer = new String[8];
answer[0] = "Answer 1";
answer[1] = "Answer 2";
answer[2] = "Answer 3";
answer[3] = "Answer 4";
answer[4] = "Answer A";
answer[5] = "Answer B";
answer[6] = "Answer C";
answer[7] = "Answer D";
for (int i = 0; i < question.length; i++) {
System.out.println(question[i]);
for (int j = 0; j<4; j++) {
System.out.println(answer[j]);
}
}
答
你可能只是改变你的代码逻辑一点点
String[]question = new String[2];
question[0] = "Question 1";
question[2] = "Question 2";
String[]answer = new String[8];
answer[0] = "Answer 1";
answer[1] = "Answer 2";
answer[2] = "Answer 3";
answer[3] = "Answer 4";
answer[4] = "Answer A";
answer[5] = "Answer B";
answer[6] = "Answer C";
answer[7] = "Answer D";
for (int i = 0; i < question.length; i++) {
System.out.println(question[i]);
for (int j = i*4; j<(i+1)*4; j++) {
System.out.println(answer[j]);
答
与此
for (int j = i*4; j<(i*4+4); j++) {
同时更换第二循环的定义,这个
question[1] = "Question 2";
我认为这是在您发布的示例代码一个错字代替第三行。
'System.out.println(answer [i * 4 + j])''。它也应该是'question [1] =“Question 2”;'(数组索引不能等于它的大小)。总的来说,将数组定义为'String questions [] = {“Question1”,“Question2”};' –
感谢Coderino! –