+
−package goodjava.io;
+
−
+
−import java.io.InputStream;
+
−import java.io.IOException;
+
−import java.nio.charset.StandardCharsets;
+
−
+
−
+
−public class DataInputStream extends java.io.DataInputStream {
+
−
+
−	public DataInputStream(InputStream in) {
+
−		super(in);
+
−	}
+
−
+
−	public String readString() throws IOException {
+
−		int len = readInt();
+
−		byte[] a = new byte[len];
+
−		readFully(a);
+
−		return new String(a,StandardCharsets.UTF_8);
+
−	}
+
−}