[英]how to pass data/values from one class to another
我是Java的新手,我正努力將變量/數組從一個類傳遞到另一個類,而gui類應該從該類打印邏輯類中的數據。
這是我的代碼如下:
Gui
班:
package testClassesGUI;
public class Gui {
public static void main(String []args){
Logic logicObject = new Logic();
logicObject.message(s);//here is an error
Logic logicObject2 = new Logic();
logicObject2.someArray(String[] someArray);//here is an error
System.out.print(logicObject.message());//here is an error
System.out.print(logicObject2.someArray());//here is an error
Logic logicObject3 = new Logic();
logicObject3.currentPoints((DominoPlayer[] player);
System.out.print(p.getName() + " has " + p.getPoints() + " Points");
}
}
Logic
類:
package testClassesGUI;
public class Logic {
String s = "hello";
public String message(String s){
return s;
}
String[] someArray = { "Great", "World" };
public String[] message2(String[] someArray){
return someArray;
}
//imagine i have imported this and I need to pass to the gui class
public void currentPoints(CardPlayer[] player) {
for (CardPlayer p : player) {
p.getName(); //pass this to the gui class
p.getPoints();//pass this to the gui class
}
}
//return p.getName() and p.getPoints()
}
您在main中有未定義的變量s
代替main中的s
,您可以編寫常量字符串"I like stackoverflow"
String s = "hello";
public String message(String s){
return s;
}
此方法期望您將一個字符串傳遞給它,然后返回相同的字符串。
嘗試:
public String message(){
return s;
}
在邏輯類中編寫以下內容:
public String message(String s){
this.s = s;
return s;
}
我不確定,但是我認為那是你的問題。 (如果這不起作用,只需交換this.s和s)
普通吸氣劑不帶任何參數
嘗試這個
String s = "hello";
public String message(){
return s;
}
String[] someArray = { "Great", "World" };
public String[] message2(){
return someArray;
}
然后這在你的main
Logic logicObject = new Logic();
System.out.print(logicObject.message());
String[] array = logicObject.message2();
for (String s: array){
System.out.print(s + " ");
}
由於message2()
返回String[]
,因此您在調用它時希望將其設置為等於String[] array = logicObject.message2();
當您嘗試執行此操作時
System.out.print(logicObject2.someArray());
因為沒有方法someArray()
所以會出現錯誤。 這里有一個someArray[]
數組,因此您可以像沒有任何()
情況那樣調用它的logicObject.someArray
。
所有錯誤清單
logicObject.message(s);
-有沒有s
宣布,你可以通過 logicObject2.someArray(String[] someArray);
-邏輯類中沒有someArray()
方法 System.out.print(logicObject.message());
- Logic
類中的message()
帶有一個參數。 System.out.print(logicObject2.someArray());
-您的Logic
類中沒有someArray()
方法。 編輯:常規數據訪問Mutator(set)
Accessor(get)
和Mutator(set)
方法
public class Logic {
private String s = "hello";
private String[] someArray = { "Great", "World" };
// getter method
public String getS(){
return s;
}
// getter method
public String[] getSomeArray(){
return someArray;
}
// setter method
public void setS(String s){
this.s = s;
}
// setter method
public void setSomeArray(String[] someArray){
this.someArray = someArray;
}
}
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