How could Java classes direct program messages to the system console, but error messages, say to a file?
The class System has a variable out that represents the standard output, and the variable err that represents the standard error device. By default, they both point at the system console. This how the standard output could be [...]

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Do I need to import java.lang package any time? Why?Or
Which package is always imported by default?
No. It is by default loaded internally by the JVM. The java.lang package is always imported by default.
Can I import same package/class twice? Will the JVM load the package twice at runtime?
One can import the same package or same class [...]

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How could Java classes direct program messages to the system console, but error messages, say to a file?
The class System has a variable out that represents the standard output, and the variable err that represents the standard error device. By default, they both point at the system console. This how the standard output could be [...]

• 0 Comments