Object + shortcut ➜ Object object = new Object();
Whether there is such shortcut?
Invoke type-matching completion By default, IntelliJ IDEA displays the code completion popup automatically as you type. If automatic completion is disabled, press Ctrl+Shift+Space or choose Code | Code Completion | Type-Matching from the main menu. If necessary, press Ctrl+Shift+Space once again.
To add or change the shortcut for any action, press Alt+Enter when it is selected in the list. Key Promoter X is a plugin that shows a popup notification with the corresponding keyboard shortcut whenever a command is executed using the mouse.
Ctrl+Alt+Shift+N : finds a symbol. In IntelliJ IDEA, a symbol is any code element such as method, field, class, constant, and so on. Ctrl+Shift+A : finds an action by name. You can find any action even if it doesn't have a mapped shortcut or appear in the menu.
As of 2017, improving on @aleksander's answer, I believe the best way to create a new object as efficiently as possible in Intellij IDEA, is this (click to enlarge):

Settings > Live Template. + to the right of the window, to add a new Live Template. n or newo). Description could be new Object .$Clazz$ $obj$ = new $Clazz$($END$);
Edit Variables button, and the fill in the Clazz and obj Expression and Default Value as shown in the picture above.Define next to No applicable contexts, to define Java > Statement as the context.Now test it: Go to the editor, type n and then the TAB key.
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