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class Test 
{ int var1;
Demo(int a)
{ var1=a;
}} 
class DerivedTest extends Test
{	int var2,var3,var4;
	public Derived Test( int x,int y)
	{	var2=x; var3=0;
		super(y);
	}
	public DerivedTest (int x)
	{ super(x);
	}}
	class MainClass{
		public Static void main(String arg[])
	DerivedTest obj=new DerivedTest(10,20);}
	}

Main.java:3: error: invalid method declaration; return type required
Demo(int a)
^
Main.java:16: error: <identifier> expected
		public Static void main(String arg[])
		             ^
Main.java:16: error: invalid method declaration; return type required
		public Static void main(String arg[])
		                   ^
Main.java:16: error: ';' expected
		public Static void main(String arg[])
		                                     ^
Main.java:18: error: class, interface, or enum expected
	}
	^
5 errors

Standard output is empty