[英]Java newInstance passing args[1]…args[args.length]
(此外:我是一個Perl程序員,正如您所知道的,這是我的第一個簡單的Java程序。簡單的用語將不勝感激。)
我有以下啟動器已編碼工作:
import java.lang.reflect.*;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.WebDriver;
/*
The following class was cobbled together by a Perl guy ...
*/
class LaunchOnLocal {
public static void main(String[] args) {
System.err.println("LaunchOnLocal.main ...");
WebDriver driver=new FirefoxDriver();
try {
// The following works but passes arg[0] to the constructor ..
Object o=createObject(Class.forName(args[0]).getConstructor(new Class[] {WebDriver.class, String[].class}),new Object[] {driver,args});
/* Fails ... Here I'm trying NOT to pass arg[0]
String[] passingArgs=new String[args.length-1];
System.arraycopy(args,1,passingArgs,0,passingArgs.length);
Object[] passingArgsArray={passingArgs};
Object o=createObject(Class.forName(args[0]).getConstructor(new Class[] {WebDriver.class, String[].class}),new Object[] {driver,passingArgsArray});
*/
}
catch (ClassNotFoundException e) {
e.printStackTrace(System.err);
}
catch (NoSuchMethodException e) {
e.printStackTrace(System.err);
}
finally {
driver.close();
driver.quit();
System.err.println("... LaunchOnLocal.main");
};
}; // main:
public static Object createObject(Constructor constructor,Object[] arguments) {
System.err.println("LaunchOnLocal.createObject ...");
System.err.println("Constructor: "+constructor.toString());
Object object=null;
try {
object=constructor.newInstance(arguments);
System.err.println("Object: "+object.toString());
//return object;
}
catch (InstantiationException e) {
e.printStackTrace(System.err);
}
catch (IllegalAccessException e) {
e.printStackTrace(System.err);
}
catch (IllegalArgumentException e) {
e.printStackTrace(System.err);
}
catch (InvocationTargetException e) {
e.getCause.printStackTrace(System.err);
}
finally {
System.err.println("... LaunchOnLocal.createObject");
return object;
}
}; // createPbkect:
}; // LaunchOnLocal:
/*
*/
按照編碼,啟動器將其所有參數“ args”傳遞給正在啟動的應用程序。 我需要在傳遞args之前刪除args [0]。 我已經嘗試了注釋掉的代碼,但是失敗了
java LaunchOnLocal Test one two
LaunchOnLocal.main ...
LaunchOnLocal.createObject ...
Constructor: public Test(org.openqa.selenium.WebDriver,java.lang.String[]) throws java.lang.InterruptedException
java.lang.IllegalArgumentException: argument type mismatch
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at LaunchOnLocal.createObject(LaunchOnLocal.java:41)
at LaunchOnLocal.main(LaunchOnLocal.java:20)
... LaunchOnLocal.createObject
... LaunchOnLocal.main
為了完整起見,我包括正在啟動的應用程序:
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.WebDriver;
public class Test {
public Test (WebDriver driver, String[] args) throws InterruptedException {
System.out.println("Test.Test ...");
for (String arg: args) {
System.out.println(arg);
};
driver.navigate().to("http://www.sojicity.com/");
Thread.sleep(10000);
// Just so we can crash!
int i=1;
//i=0; // uncomment this line to cause an error
i=i/i;
System.out.println("... Test.Test.");
}; // Test:
}; // Test:
我在轉換后無法成功傳遞args,這是我做錯了什么?
fge建議的更正工作! 變
Object o=createObject(Class.forName(args[0]).getConstructor(new Class[] {WebDriver.class, String[].class}),new Object[] {driver,args});
至
Object o=createObject(Class.forName(args[0]).getConstructor(new Class[] {WebDriver.class, String[].class}),new Object[] {driver,Arrays.copyOfRange(args, 1, args.length)});
嘗試使用:
Arrays.copyOfRange(args, 1, args.length)
代替。 這要簡單得多,並且無論如何都會在內部使用System.arrayCopy()
。
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