ByteArrayInputStream
In this chapter you will learn:
Use ByteArrayInputStream
ByteArrayInputStream is an implementation of an
InputStream that uses a byte array as the source.
This class has two constructors, each of which requires a byte array to provide the data source:
ByteArrayInputStream(byte array[ ])
array is the input source.ByteArrayInputStream(byte array[ ], int start, int numBytes)
uses a subset of your byte array.
The following code creates ByteArrayInputStream from byte array
import java.io.ByteArrayInputStream;
import java.io.IOException;
/*j a va2 s .c om*/
public class Main {
public static void main(String args[]) throws IOException {
String tmp = "abcdefghijklmnopqrstuvwxyz";
byte b[] = tmp.getBytes();
ByteArrayInputStream input1 = new ByteArrayInputStream(b);
ByteArrayInputStream input2 = new ByteArrayInputStream(b, 0, 3);
}
}
Mark and reset positions in ByteArrayInputStream
A ByteArrayInputStream implements both mark( ) and reset( ).
The following example uses the reset( ) method to read the same input twice.
import java.io.ByteArrayInputStream;
import java.io.IOException;
//j ava2 s. c o m
public class Main {
public static void main(String args[]) throws IOException {
String tmp = "abc";
byte b[] = tmp.getBytes();
ByteArrayInputStream in = new ByteArrayInputStream(b);
for (int i = 0; i < 2; i++) {
int c;
while ((c = in.read()) != -1) {
if (i == 0) {
System.out.print((char) c);
} else {
System.out.print(Character.toUpperCase((char) c));
}
}
System.out.println();
in.reset();
}
}
}
Next chapter...
What you will learn in the next chapter:
- How to use PrintStream
- Use PrintStream through System.out.printf
- Create PrintStream from File object and redirect System.out.println
- How to use PrintStream to print to a file
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