Efficiency of Java "Double Brace Initialization"?

javaperformancecollectionsinitialization
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String concatenation: concat() vs "+" operator

javastringconcatenation
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Java using much more memory than heap size (or size correctly Docker memory limit)

javalinuxjvmdockermemory
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Uses for Optional

javajava-8optional
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Using context in a fragment

javaandroidandroid-fragmentsandroid-context
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breakpointsrelative-time-spanzero-padhighlightoption-strictsoft-keyboardmove-semanticswhere-clausestateweb-scrapinggethashcoderight-clickandroid-9.0-piemallocaggregation-frameworkexpression-treeshtml-content-extractiontemplatingrdbmsoptional