[英]Java- use a variable from another file
如何使用另一個文件中的變量? 我正在編寫自動化測試(Selenium 和 TestNG)。 我想將一些數據變量和 xpath 存儲在一個單獨的文件中(secondFile.java)
主文件:
import secondFile.help;
public class TicketAdminTestSuite extends something {
void printStuff(){
System.out.println(bar);
}
}
===============================================
幫助文件(名稱:help.java):
public class help {
public static final String bar = "blah";
}
您的代碼中有兩個嚴重錯誤:
- 幫助文件名必須與類名相同
- 主文件中的導入必須以完整的包名導入幫助文件(我假設文件在同一個包中)
// master file TicketAdminTestSuite.java
import Help;
public class TicketAdminTestSuite extends something {
void printStuff(){
System.out.println(Help.bar);
}
}
// help file Help.java
public class Help {
public static final String bar = "blah";
}
只需編寫 help.bar:
void printStuff(){
System.out.println(help.bar);
但是這個例子有點混亂,因為公共類必須和 .java 文件一樣被調用。 而且,如果您在 secoundfile 中創建了第二個類,您將無法從第一個文件中訪問它。 這將是一個更好的例子: import secondFile;
public class TicketAdminTestSuite extends something {
void printStuff(){
System.out.println(secondFile.BAR);
}
}
第二個文件是這樣制作的
public class secondFile {
public static final String BAR = "blah";
}
最簡單的方法是導入您的help
類並像這樣訪問它:
import help;
...
String test = help.bar;
...或者您可以使用靜態導入:
import static help.bar;
...
String test = bar;
public class
名應與其文件名匹配。
例如:
第一個.java
import demo.Second;
public class First{
Second second=new Second();
void printStuff(){
System.out.println(second.getBar());
}
}
二.java
package demo;
public class Second{
String bar="blah";
public String getBar(){
return this.bar;
}
}
這很痛苦,但我設法做到了。 我的第一個文件“Main.java”的代碼是:
import maintu.*;
public class Main extends maintu.Maintu {
public static void main(String[] args) {
System.out.println("println");
System.out.println("I am on a different line");
System.out.print("I am print ");
System.out.print("I will be on the same line ");
System.out.println(3 + 3);
// I will be ignored
System.out.println("there is a comment after me"); // so will I
//System.out.println("I will be ignored too");
/* I will be ignored until I end
not over yet.
Now i am over*/
System.out.println("I will print though");
String variable = "you can use me to call on me for later ";
System.out.println(variable + "and I dont need quotes!");
int numVariable = 13;
System.out.print("my number is " + numVariable + ".");
String hi;
hi = "This works too!";
System.out.println(hi);
int x;
x = 10;
x = 20;
System.out.println(x);
final String finel = "I cannot change";
final int que; // I will always be empty. not 0, empty
int w = 5, y = 6, z = 50; /*you can set several variables in one line like this*/
/*you can do this as well :
int x, y, z;
x = y = z = 50;
*/
int wholenumber = 1;
float onepointone = 5.99f;
char onesinglecharacter = 'D';
boolean truefalse = true;
String unlimitedwords = "string = words";
byte onezero = -13;
short hexagecimal = -13000;
long isverylong = -4775808;
double bdoublo;
x=0;
System.out.println(maintu.Maintu.maybe);/*
while(true) {
x = x + 1;
System.out.print(x + " ");
}*/
}
}
我的代碼,正如你所說的“幫助”文件,“maintu.java”是:
package maintu;
public class Maintu {
public static String maybe = "extends";
}
我這樣做的方法是:在命令提示符下為文件編寫代碼:在命令提示符下運行javac Maintu.java
:在命令提示符下運行javac Maintu.java
:在命令提示符下運行javac Main.java
:運行java Main.java
命令提示符輸出:
println
I am on a different line
I am print I will be on the same line 6
there is a comment after me
I will print though
you can use me to call on me for later and I dont need quotes!
my number is 13.This works too!
20
extends
我正在使用 java 17
使用 getter 方法。
public class help {
public static final String bar = "blah";
public String getBar(){
return this.bar;
}
}
然后在你的代碼上使用它。
import secondFile.help;
public class TicketAdminTestSuite extends something {
Help help = new Help();
void printStuff(){
System.out.println(help.getBar());
}
}
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.