Why is Java Vector (and Stack) class considered obsolete or deprecated?

javastackvectordeprecatedobsolete
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How and when to use ‘async’ and ‘await’

asynchronousc#.netasync-await
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What is a NumberFormatException and how can I fix it?

javaarrayswhile-loopnumberformatexception
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Java multiple file transfer over socket

java
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How to use GROUP BY to concatenate strings in SQL Server?

sqlsql-serverstring-concatenationsql-server-group-concat
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