Using or ‘|’ in regex [duplicate]

It’s because you are trying to match against the entire string instead of the part to find. For example, this code will find that only a part of the string is conforming to the present regex: When you want to match an entire string and check if that string contains he|be|de use this regex .*(he|be|de).* . means … Read more

Finding white rectangle in an image

This is very rough, but successfully finds all the white pixels in the image, more checking can be done to ensure it is the size you want and everything is there but the basics are there. PS: I have not tested with your image. r and this.rc is picture size and p and this.px is … Read more

What does Java option -Xmx stand for? [duplicate]

see here: Java Tool Doc, it says, -XmxnSpecify the maximum size, in bytes, of the memory allocation pool. This value must a multiple of 1024 greater than 2MB. Append the letter k or K to indicate kilobytes, or m or M to indicate megabytes. The default value is 64MB. The upper limit for this value will … Read more

How do I convert a String to an int in Java?

If you look at the Java documentation you’ll notice the “catch” is that this function can throw a NumberFormatException, which of course you have to handle: (This treatment defaults a malformed number to 0, but you can do something else if you like.) Alternatively, you can use an Ints method from the Guava library, which in combination with Java 8’s Optional, makes … Read more

What does Java option -Xmx stand for? [duplicate]

see here: Java Tool Doc, it says, -XmxnSpecify the maximum size, in bytes, of the memory allocation pool. This value must a multiple of 1024 greater than 2MB. Append the letter k or K to indicate kilobytes, or m or M to indicate megabytes. The default value is 64MB. The upper limit for this value will … Read more