英文:
Ignore null value while looping through an array
问题
我正在构建一个方法，该方法从我的数组中打印出特定的值。问题是，数组中的每个值都由构造函数给出多个值，因此数组看起来像这样：
Constructor1[] tab1 = {new Constructor1 (var1: 1, var2: 3, var3: "Hi"),
null,
new Constructor1 (var1: 3, var2: 2, var3: "Ho"),
null}...
null 值对应于我构造函数的空实例，我不想删除它们。当我遍历数组时，我使用另一个类中构建的 getter 来获取特定的值。
for (int i = 0, i<= tab1.length, i++) {
if (tab[i].getVar2() == 2){
System.out.print(tab[i]);
}
}
我可以正确地将值打印出来，直到遍历到 null，这会停止我的程序。我的程序目标是从数组中提取某些内容并将它们保存到文件中，但由于 null，我无法提取我想要的所有内容。为了这个项目，我使用 FileReader、PrintReader 等等...
英文:
I'm building a method which prints certain specific values from my array. The thing is, each value from that array has multiple values given by a constructor so the array looks like this :
Constructor1[] tab1 = {new Constructor1 (var1: 1, var2: 3, var3: "Hi"),
null,
new Constructor1 (var1: 3, var2: 2, var3: "Ho"),
null}...
The null values correspond to empty instances of my constructor and I do not want to delete them. When I loop through my array I use a getter I built in another class to get the specific value.
for (int i = 0, i<= tab1.length, i++) {
if (tab[i].getVar2() == 2){
System.out.print(tab[i]);
}
}
I can get the values to print right until I loop through null, which stops my program. The goal to my program is to extract certain things from the array and save them onto a file, but I cant extract everything I want because of null. For the purpose of this project I use FileReader, PrintReader etc...
答案1
得分: 2
以下是您要翻译的内容：
添加一个空值检查：
for (int i = 0; i <= tab1.length; i++) {
if (tab[i] != null && tab[i].getVar2() == 2) {
System.out.print(tab[i]);
}
}
英文:
Put a null check
for (int i = 0, i<= tab1.length, i++) {
if (tab[i]!=null &&tab[i].getVar2() == 2){
System.out.print(tab[i]);
}
}
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