Check if a String contains encoded characters

Question

Hello I am looking for a way to detect if a string has being encoded

For example

    String name = \"Hellä world\";
    String encoded = new String(n         


        

Answer 1

If I correctly understood your question, this code may help you. The function isEncoded check if its parameter could be encoded as ascii or if it contains non ascii-chars.

public boolean isEncoded(String text){

    Charset charset = Charset.forName("US-ASCII");
    String checked=new String(text.getBytes(charset),charset);
    return !checked.equals(text);

}

@Test
public void testAscii() throws Exception{
    Assert.assertFalse(isEncoded("Hello world"));
}


@Test
public void testNonAscii() throws Exception{
    Assert.assertTrue(isEncoded("Hellä world"));
}

You can also check for other charset changing charset var or moving it to a parameter.