我将不得不在不久的将来使用JavaCompilers，因此我现在尝试学习基础知识，并选择最好的基础知识，而我遇到了一个问题，那就是我无法真正解决在线问题
目前，我正在查看JavaCompiler。如果我有一个正在评估的程序X，它从System.in接收输入并将输出打印到System.out，
可以在输入某些特定输入并将其输出捕获到文件中的同时编译并运行它？
如果是这样，是否有在线示例，以便我可以更好地理解？
编辑：
编译时传递的简单测试用例
import java.util.Iterator;
public class TestSet
{
public static void main(String[] args)
{
try
{
System.out.print( "[1]--constructor 1, size, isEmpty: ");
LinkedSet<String> s1 = new LinkedSet<String>();
if (s1.size() != 0)
System.out.print("*** size? ***");
if (!s1.isEmpty())
System.out.print("*** isEmpty? ***");
System.out.println();
}
catch(Exception e)
{
System.out.println("*** CRASH !!! ***");
}
try
{
System.out.print( "[2]--constructor 2, size, isEmpty: ");
LinkedSet<String> s1 = new LinkedSet<String>( "alpha");
if (s1.size() != 1)
System.out.print("*** size? ***");
if (s1.isEmpty())
System.out.print("*** isEmpty? ***");
System.out.println();
}
catch(Exception e)
{
System.out.println("*** CRASH !!! ***");
}
try
{
System.out.print( "[3]--contains: ");
LinkedSet<String> s1 = new LinkedSet<String>("alpha");
if (!s1.contains("alpha"))
System.out.print("*** elt. not found ***");
if (s1.contains("beta"))
System.out.print("*** non-elt ``found'' ***");
System.out.println();
}
catch(Exception e)
{
System.out.println("*** CRASH !!! ***");
}
try
{
System.out.print( "[4]--add: ");
LinkedSet<String> s1 = new LinkedSet<String>();
s1.add("alpha");
s1.add("beta");
s1.add("gamma");
if (s1.size() != 3)
System.out.print("*** size? ***");
if (!s1.contains("alpha") ||
!s1.contains("beta") ||
!s1.contains("gamma"))
System.out.print("*** elt. not found ***");
if (s1.contains("delta"))
System.out.print("*** non-elt ``found'' ***");
s1.add("beta");
if (s1.size() != 3)
System.out.print("*** size/duplicates? ***");
System.out.println();
}
catch(Exception e)
{
System.out.println("*** CRASH !!! ***");
}
try
{
System.out.print( "[5]--remove: ");
LinkedSet<String> s1 = new LinkedSet<String>();
s1.add("alpha");
s1.add("beta");
s1.add("gamma");
s1.remove("beta");
s1.remove("alpha");
s1.remove("gamma");
if (s1.size() != 0)
System.out.print("*** size? ***");
if (s1.contains("alpha") ||
s1.contains("beta") ||
s1.contains("gamma"))
System.out.print("*** non elt. ``found'' ***");
System.out.println();
}
catch(Exception e)
{
System.out.println("*** CRASH !!! ***");
}
try
{
System.out.print( "[6]--print: ");
LinkedSet<String> s1 = new LinkedSet<String>();
s1.add("this");
s1.add("is");
s1.add("assignment");
s1.add("four");
s1.print();
}
catch(Exception e)
{
System.out.println("*** CRASH !!! ***");
}
try
{
System.out.print( "[7]--addAll: ");
LinkedSet<String> s1 = new LinkedSet<String>();
s1.add("alpha");
s1.add("beta");
s1.add("gamma");
LinkedSet<String> s2 = new LinkedSet<String>();
s2.add("beta");
s2.add("delta");
s1.addAll(s2);
if (!s1.contains("alpha") || ! s1.contains("beta") ||
!s1.contains("gamma") || !s1.contains("delta"))
System.out.print("*** elt. ``dropped'' ***");
if (s1.size() != 4)
System.out.print("*** size ? ***");
System.out.println();
}
catch(Exception e)
{
System.out.println("*** CRASH !!! ***");
}
try
{
System.out.print( "[8]--containsAll: ");
LinkedSet<String> s1 = new LinkedSet<String>();
s1.add("alpha");
s1.add("beta");
s1.add("gamma");
LinkedSet<String> s2 = new LinkedSet<String>();
s2.add("beta");
s2.add("delta");
if (s1.containsAll(s2))
System.out.print("*** non-containment incorrect ***");
LinkedSet<String> s3 = new LinkedSet<String>();
s3.add("beta");
s3.add("alpha");
if (!s1.containsAll(s3))
System.out.print("*** containment incorrect ***");
System.out.println();
}
catch(Exception e)
{
System.out.println("*** CRASH !!! ***");
}
try
{
System.out.print( "[9]--removeAll: ");
LinkedSet<String> s1 = new LinkedSet<String>();
s1.add("alpha");
s1.add("beta");
s1.add("gamma");
s1.add("delta");
LinkedSet<String> s2 = new LinkedSet<String>();
s2.add("beta");
s2.add("delta");
s1.removeAll(s2);
if (s1.contains("beta") || s1.contains("delta"))
System.out.print("*** some elts not removed? ***");
if (!s1.contains("alpha") || !s1.contains("gamma"))
System.out.print("*** wrong elts removed? ***");
System.out.println();
}
catch(Exception e)
{
System.out.println("*** CRASH !!! ***");
}
try
{
System.out.print( "[10]--retainAll: ");
LinkedSet<String> s1 = new LinkedSet<String>();
s1.add("alpha");
s1.add("beta");
s1.add("gamma");
s1.add("delta");
LinkedSet<String> s2 = new LinkedSet<String>();
s2.add("beta");
s2.add("delta");
s1.retainAll(s2);
if (s1.contains("alpha") || s1.contains("gamma"))
System.out.print("*** wrong elts retained? ***");
if (!s1.contains("beta") || !s1.contains("delta"))
System.out.print("*** wrong elts removed? ***");
System.out.println();
}
catch(Exception e)
{
System.out.println("*** CRASH !!! ***");
}
try
{
System.out.print( "[11]--elements: ");
LinkedSet<String> s1 = new LinkedSet<String>();
s1.add("alpha");
s1.add("beta");
s1.add("gamma");
s1.add("delta");
Iterator<String> list = s1.elements();
System.out.print("("+list.hasNext()+") ");
if (list.hasNext())
System.out.print(list.next()+"; ");
System.out.print("("+list.hasNext()+")");
if (list.hasNext())
System.out.print(list.next()+"; ");
System.out.print("("+list.hasNext()+")");
if (list.hasNext())
System.out.print(list.next()+"; ");
System.out.print("("+list.hasNext()+")");
if (list.hasNext())
System.out.print(list.next()+"; ");
System.out.print("("+list.hasNext()+")");
if (list.hasNext())
System.out.print(list.next()+"; ");
System.out.println();
}
catch(Exception e)
{
System.out.println("*** CRASH !!! ***");
}
}
}
最佳答案
是的，你可以......
1.您是否在谈论命令行参数，如果可以，那么可能。
例如：
javac Test.java
enter code herejava Test Hello // Hello is the Input
在Java中，此“ Hello”输入被发送到String []数组中的main（）方法。
public static void main(String[] args)因此，要访问已作为参数传递给
Hello方法参数的main()，您需要执行此操作。 String s = args[0];
2.现在，如果要从程序内部将其写入文件中，请执行此操作。
String s = args[0];
File f = new File(d:\\vivek.txt);
FileWriter fw = new FileWriter(f);
BufferedWriter bw = new BufferedWriter(fw);
bw.write(s);