我正在使用for循环,每次循环都需要返回一个String,但是使用“return”会打破循环,Eclipse会抛出“无法访问的代码”错误。任何建议
答案 0 :(得分:2)
如果返回ArrayList<String>
,则不适合您的应用程序,这听起来像是回拨函数的工作。定义回叫接口:
public interface StringDelivery {
public void processString(String aString);
}
然后在你的循环中你可以回电话:
public void loopThroughStrings(StringDelivery callback) {
for (. . .) {
String nextString = . . .
callback.processString(nextString);
}
}
然后,您可以使用任何实现该接口的对象来调用它。
编辑:
如果你正在计算一堆字符串但需要将它们作为单个字符串返回,那么你可以将它们放在一个数组中然后使用Arrays.toString(Object[] array)
将整个数组转换为单个字符串:
int n = <number of strings>
String[] strings = new String[n];
for (int i = 0; i < n; ++i) {
strings[i] = <i-th string>
}
return Arrays.toString(strings);
返回值将使用“,”分隔的列表元素进行格式化,并用方括号括起来:“[]”。
答案 1 :(得分:2)
我认为你的逻辑被打破了
for (int counter = 0; counter < possibleAnswers.length; counter++){
// This condition will be meet immediately because 0 is less then 25...
if (counter < 25){
return alpha[counter] + ": " + possibleAnswers[counter] + "\n";
}
// Meaning it is impossible for the program to ever reach this line...
if (counter >= 26){
return alpha[26] + a + ": " + possibleAnswers[counter] + "\n";
a++;
}
}
我认为你可能会更喜欢尝试......
StringBuilder sb = new StringBuilder(25);
for (int counter = 0; counter < possibleAnswers.length; counter++){
if (counter < 25){
sb.append(alpha[counter] + ": " + possibleAnswers[counter] + "\n");
}
if (counter >= 26){
sb.append(alpha[26] + a + ": " + possibleAnswers[counter] + "\n");
a++;
}
}
return sb.toString();
更新工作示例
String possibleAnswers[] = new String[30];
String alpha[] = new String[30];
for (int index = 0; index < 30; index++) {
possibleAnswers[index] = "Happy " + index;
alpha[index] = Integer.toString(index);
}
int a = 0;
StringBuilder sb = new StringBuilder(25);
for (int counter = 0; counter < possibleAnswers.length; counter++) {
if (counter < 25) {
sb.append(alpha[counter]).append(": ").append(possibleAnswers[counter]).append("\n");
}
if (counter >= 26) {
sb.append(alpha[26]).append(a).append(": ").append(possibleAnswers[counter]).append("\n");
a++;
}
}
System.out.println(sb);
哪个输出
0: Happy 0
1: Happy 1
2: Happy 2
3: Happy 3
4: Happy 4
5: Happy 5
6: Happy 6
7: Happy 7
8: Happy 8
9: Happy 9
10: Happy 10
11: Happy 11
12: Happy 12
13: Happy 13
14: Happy 14
15: Happy 15
16: Happy 16
17: Happy 17
18: Happy 18
19: Happy 19
20: Happy 20
21: Happy 21
22: Happy 22
23: Happy 23
24: Happy 24
260: Happy 26
261: Happy 27
262: Happy 28
263: Happy 29
答案 2 :(得分:0)
您将需要使用ArrayList存储所有字符串。
然后在for循环完成后返回ArrayList。像。的东西。
String returnString = "";
for loop ....{
returnString = returnString + " " + someNewString;
}
return returnString
答案 3 :(得分:0)
为什么复杂化问题..只返回一个字符串数组
public String[] function1()
{
String[] str1 new String(10);
for(int i=0;i<10;i++)
{
str1[i] ="string"+i;
}
return str1;
}
答案 4 :(得分:0)
您应该考虑从该方法返回一个String数组。
只是纠正for循环不会返回任何内容。它是返回值的函数。
最后很难评论,因为它不清楚你想要达到的目标。