Recent questions tagged java:

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java: "final" System.out, System.in and System.err?

System.out is declared as public static final PrintStream out. But you can call System.setOut() to reassign it ... System.in/out/err behaved as final variables) Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java: Class.isInstance vs Class.isAssignableFrom

Let clazz be some Class and obj be some Object. Is clazz.isAssignableFrom(obj.getClass()) always the same as clazz. ... obj) ? If not, what are the differences? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java: How can I do dynamic casting of a variable from one type to another?

I would like to do dynamic casting for a Java variable, the casting type is stored in a different variable. This ... sees it as Integer and I have type problem. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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785 views

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java: (String[])List.toArray() gives ClassCastException

The following code (run in android) always gives me a ClassCastException in the 3rd line: final String[] v1 = ... there are Strings in it. Any Idea why? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java: package jdk.incubator.foreign is not visible error in Java 15

So I have downloaded JDK 15 - OpenJDK . Running in Intelij the following code import jdk.incubator.foreign.MemorySegment; ... -jdk-incubator-foreign-is-not-visible-error-in-java-15...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java: Using stream.forEach() or stream.forEachOrdered() on putting stuff into a set

If I want to add elements from a stream to a set using stream().forEach(e->{set.add(e)}, would it ... /java-using-stream-foreach-or-stream-foreachordered-on-putting-stuff-into-a...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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