>209
// BinaryToDecimal.java
public class BinaryToDecimal {
public static void main(String[] args) {
if( args.length != 1 ) {
System.out.println( "使いかた：java BinaryToDecimal [2進数]" );
return;
}
try {
int binary = Integer.parseInt( args[0], 2 );
System.out.println( binary );
} catch( NumberFormatException nfe ) {
System.out.println( "2進数ではありません：" + args[0] );
}
}
}