Java：バイナリ表示

Java でバイナリを表示するには、toBinaryString()関数を使うと簡潔に表現できます。

	public class Checksum
	{
	static int checksum(int list[])
	{
	int sum=0;
	for(int x:list)
	{
	sum+=x;
	}
	sum+=sum>>4;
	sum=~sum;
	return sum&0b1111;
	}
	static String binary(int x)
	{
	return String.format("%4s", Integer.toBinaryString(x)).replace(' ', '0');
	}
	public static void main(String args[])
	{
	int list[]={0b0000,0b0100,0b1000,0b1100};
	for(int x:list)
	{
	System.out.println(binary(x));
	}
	System.out.println("checksum: "+binary(Checksum.checksum(list)));
	int newList[]={0b0000,0b0100,0b1000,0b1100,Checksum.checksum(list)};
	System.out.println("checksum: "+binary(Checksum.checksum(newList)));
	}
	}

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