问题描述
我有一段令人困惑的代码.我在if/else语句中定义了一个整数数组，因为该数组的长度取决于该方法的2个输入的长度.我的问题是，在if/else语句之外，变量定义似乎丢失了.
I have a section of code that is puzzling me. I define an integer array inside an if/else statement because the length of the array depends on the length of 2 inputs to the method. My problem is that outside the if/else statement, the variable definition seems to be lost.
import java.util.Arrays;
public class test {
public String AddArrays(int [] arg1, int [] arg2) {
int L1 = arg1.length;
int L2 = arg2.length;
if (L1 > L2) {
int[] output = new int[L2];
for (int i = 0; i < L2; i++) {
output[i] = arg1[i] + arg2[i];
}
} else {
int[] output = new int[L1];
for (int i = 0; i < L2; i++) {
output[i] = arg1[i] + arg1[i];
}
}
String result = Arrays.toString(output);
return result;
}
}
我得到的错误是在语句String result = Arrays.toString(output);上，Eclipse告诉我output无法解析为变量.
The error I get is on the statement String result = Arrays.toString(output); where Eclipse tells me that output cannot be resolved to a variable.
...并且顺便说一句，是的，我知道这不是添加两个整数数组的方法-我从更复杂的代码中简化了此过程以演示问题！
...and by the way, yes, I know that this is not the way to add two integer arrays -- I reduced this from more complex code to demonstrate the problem!
推荐答案
在if语句之前定义output.像这样:
Define output before if statement. Like this:
int[] output;
int L1 = arg1.length;
int L2 = arg2.length;
if (L1 > L2) {
output = new int[L2];
for (int i = 0; i < L2; i++) {
output[i] = arg1[i] + arg2[i];
}
} else {
output = new int[L1];
for (int i = 0; i < L2; i++) {
output[i] = arg1[i] + arg1[i];
}
}
String result = Arrays.toString(output);
return result;
}
在if语句中声明output时，它仅具有该块作用域.
When you declared output inside the if statement it simply had only that block scope.
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