Java 我的目标是从这两个方法中获得cType和cSize的值，但它会不断返回；nullnull"； 公共类主 { 静态字符串clotheOrder[]={“FB02”，null，null，null，“TS03”，“GS04”，null，“PA03”}； intClothEquantity[]={3,0,2,0,2,2,0,0}； 静态字符串cType，cSize； ``` 公共静态void main（字符串[]args）{ 对于（int x=0；x

，在我看来，您的问题之一是由于使用引用比较（

=

）而不是值比较（

.equals

）

另一个原因是正则表达式字符串的作用与您想要的相反

---

交换正则表达式字符串，并将

==

更改为

.equals（）

，函数应该可以正常工作。

Hi@AugustusMoran，欢迎使用堆栈溢出。获取null的原因是java使用

.equals（）

（）来比较字符串。您可以使用say

开关（大小）{case“01”：..

或将==更改为.equals（）以使其工作。

public class Main
{
    static String clotheOrder[] = {"FB02", null, null, null, "TS03", "GS04", null, "PA03"};
    int clotheQuantity[] = {3, 0, 2, 0, 2, 2, 0, 0};
    static String cType, cSize;

```
    public static void main(String[] args) {
        for (int x = 0; x <= clotheOrder.length; x++) {
            
            if (clotheOrder[x] == null) {
                
                System.out.println("No order");
                continue;
            }
            else {
            System.out.println(clotheType(clotheOrder[x].replaceAll("[^0-9]", "")) 
                               + clotheSize(clotheOrder[x].replaceAll("[^A-Z]", "")));
            }
        }
    }
    static String clotheType(String type) {
            
                 if (type == "FB" ) {cType = "Blouse .............";}
            else if (type == "TS" ) {cType = "T-Shirt ............";}
            else if (type == "GS" ) {cType = "Garterized Shorts ..";}
            else if (type == "PA" ) {cType = "Pants ..............";}
            else if (type == "PS" ) {cType = "Pencil Skirt .......";}
            else if (type == "CC" ) {cType = "Chinese Collar Polo ";}
            else if (type == "PW" ) {cType = "White Slacks .......";}
            else if (type == "RB" ) {cType = "Round Neck Blouse ..";}
            else if (type == "S"  ) {cType = "Skirt ..............";}
            else if (type == "VN" ) {cType = "V-Neck Polo ........";}
                 
            return cType;
    }
    
    static String clotheSize(String size) {
        
                 if (size == "01") {cSize = " (Extra-Small) ...";}
            else if (size == "02") {cSize = " (Small) .........";}
            else if (size == "03") {cSize = " (Medium) ........";}
            else if (size == "04") {cSize = " (Large) .........";}
            else if (size == "05") {cSize = " (X-Large) .......";}
            else if (size == "06") {cSize = " (2X-Large) ......";}
            else if (size == "07") {cSize = " (3X-Large) ......";}
            else if (size == "08") {cSize = " (Add-ons) .......";}
                
            return cSize;
    }
}
```