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Our interview questions bank will help you learn to tackle tough interview questions with ease. With over 120 questions, you can cover all important topics to impress hiring managers.[/fusion_text][/fusion_builder_column][/fusion_builder_row][/fusion_builder_container][fusion_builder_container type=”flex” hundred_percent=”no” hundred_percent_height=”no” min_height=”” hundred_percent_height_scroll=”no” align_content=”stretch” flex_align_items=”flex-start” flex_justify_content=”flex-start” flex_column_spacing=”” hundred_percent_height_center_content=”yes” equal_height_columns=”no” container_tag=”div” menu_anchor=”” hide_on_mobile=”small-visibility,medium-visibility,large-visibility” status=”published” publish_date=”” class=”” id=”” margin_top_medium=”” margin_bottom_medium=”” margin_top_small=”” margin_bottom_small=”” margin_top=”” margin_bottom=”” padding_top_medium=”” padding_right_medium=”” padding_bottom_medium=”” padding_left_medium=”” padding_top_small=”” padding_right_small=”” padding_bottom_small=”” padding_left_small=”” padding_top=”” padding_right=”” padding_bottom=”” padding_left=”” link_color=”” link_hover_color=”” border_sizes_top=”10px” border_sizes_right=”10px” border_sizes_bottom=”10px” border_sizes_left=”10px” border_color=”#007dc6″ border_style=”solid” box_shadow=”yes” box_shadow_vertical=”4″ box_shadow_horizontal=”4″ box_shadow_blur=”30″ box_shadow_spread=”0″ box_shadow_color=”rgba(0,0,0,0.32)” box_shadow_style=”” z_index=”” overflow=”” gradient_start_color=”” gradient_end_color=”” gradient_start_position=”0″ gradient_end_position=”100″ gradient_type=”linear” radial_direction=”center center” linear_angle=”180″ background_color=”” background_image=”” background_position=”center center” background_repeat=”no-repeat” fade=”no” background_parallax=”none” enable_mobile=”no” parallax_speed=”0.3″ background_blend_mode=”none” video_mp4=”” video_webm=”” video_ogv=”” video_url=”” video_aspect_ratio=”16:9″ video_loop=”yes” video_mute=”yes” video_preview_image=”” render_logics=”” absolute=”off” absolute_devices=”small,medium,large” sticky=”off” sticky_devices=”small-visibility,medium-visibility,large-visibility” sticky_background_color=”” sticky_height=”” sticky_offset=”” sticky_transition_offset=”0″ scroll_offset=”0″ animation_type=”” animation_direction=”left” animation_speed=”0.3″ animation_offset=”” filter_hue=”0″ filter_saturation=”100″ filter_brightness=”100″ filter_contrast=”100″ filter_invert=”0″ filter_sepia=”0″ filter_opacity=”100″ filter_blur=”0″ filter_hue_hover=”0″ filter_saturation_hover=”100″ filter_brightness_hover=”100″ filter_contrast_hover=”100″ filter_invert_hover=”0″ filter_sepia_hover=”0″ filter_opacity_hover=”100″ filter_blur_hover=”0″][fusion_builder_row][fusion_builder_column type=”1_1″ layout=”1_1″ align_self=”auto” content_layout=”column” align_content=”flex-start” valign_content=”flex-start” content_wrap=”wrap” spacing=”” center_content=”no” link=”” target=”_self” min_height=”” hide_on_mobile=”small-visibility,medium-visibility,large-visibility” sticky_display=”normal,sticky” class=”” id=”” background_image_id=”” type_medium=”” type_small=”” order_medium=”0″ order_small=”0″ spacing_left_medium=”” spacing_right_medium=”” spacing_left_small=”” spacing_right_small=”” spacing_left=”” spacing_right=”” margin_top_medium=”” margin_bottom_medium=”” margin_top_small=”” margin_bottom_small=”” margin_top=”” margin_bottom=”” padding_top_medium=”” padding_right_medium=”” padding_bottom_medium=”” padding_left_medium=”” padding_top_small=”” padding_right_small=”” padding_bottom_small=”” padding_left_small=”” padding_top=”20px” padding_right=”20px” padding_bottom=”20px” padding_left=”20px” hover_type=”none” border_sizes_top=”” border_sizes_right=”” border_sizes_bottom=”” border_sizes_left=”” border_color=”” border_style=”solid” border_radius_top_left=”” border_radius_top_right=”” border_radius_bottom_right=”” border_radius_bottom_left=”” box_shadow=”no” box_shadow_vertical=”” box_shadow_horizontal=”” box_shadow_blur=”0″ box_shadow_spread=”0″ box_shadow_color=”” box_shadow_style=”” background_type=”single” gradient_start_color=”” gradient_end_color=”” gradient_start_position=”0″ gradient_end_position=”100″ gradient_type=”linear” radial_direction=”center center” linear_angle=”180″ background_color=”” background_image=”” background_position=”left top” background_repeat=”no-repeat” background_blend_mode=”none” render_logics=”” filter_type=”regular” filter_hue=”0″ filter_saturation=”100″ filter_brightness=”100″ filter_contrast=”100″ filter_invert=”0″ filter_sepia=”0″ filter_opacity=”100″ filter_blur=”0″ filter_hue_hover=”0″ filter_saturation_hover=”100″ filter_brightness_hover=”100″ filter_contrast_hover=”100″ filter_invert_hover=”0″ filter_sepia_hover=”0″ filter_opacity_hover=”100″ filter_blur_hover=”0″ animation_type=”” animation_direction=”left” animation_speed=”0.3″ animation_offset=”” last=”true” border_position=”all” first=”true”][fusion_accordion type=”accordions” boxed_mode=”no” border_size=”1″ border_color=”” background_color=”” hover_color=”” divider_line=”” title_font_size=”” icon_size=”” icon_color=”” icon_boxed_mode=”” icon_box_color=”#4f4f4f” icon_alignment=”right” toggle_hover_accent_color=”#3ed9df” hide_on_mobile=”small-visibility,medium-visibility,large-visibility” class=”interview_list” id=””][fusion_toggle title=”Question 41 : What is the preferred size of a Java component?” open=”no” class=”” id=””]
Answer:
A Java component’s preferred size is the minimum component size that allows the component to display normally.
[/fusion_toggle][fusion_toggle title=”Question 42 : What method is used to specify a container’s layout in Java?” open=”no” class=”” id=””]
Answer:
The setLayout() method is useful for specifying a container’s layout. For instance, setLayout(new FlowLayout()); will be set the layout as FlowLayout.
[/fusion_toggle][fusion_toggle title=”Question 43 : What is the Collections API in Java?” open=”no” class=”” id=””]
Answer:
The Collection API in Java is a set of classes & interfaces that support operation on the collections of objects. Those classes & interfaces are more powerful, flexible, & regular than the vectors, arrays, and hash tables, if replaced effectively.
[/fusion_toggle][fusion_toggle title=”Question 44 : What is an Iterator interface in Java?” open=”no” class=”” id=””]
Answer:
An Iterator interface is used as an alternative for enumerations in Java Collection. However, an Iterator differs from the enumerations in two ways:
- It allows the caller to remove the given elements from a specified collection during the element’s Iteration.
- Method names have been enhanced.
[/fusion_toggle][fusion_toggle title=”Question 45 : What is the difference between sleeping & yielding?” open=”no” class=”” id=””]
Answer:
Following are the differences between yielding & sleeping:
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| Yielding | Sleeping |
|---|---|
| Yield causes the thread to rejoin the queue in the CPU. | Sleep suspends thread from running for a specified time. |
| When a task is invoked in the yielding method, it returns to the ready state. | When a task is invoked in the sleeping method, it returns to the waiting state. |
| Yielding facilitates the running thread into out of runnable state with the same priority. | Sleeping is useful to delay the execution for a while. |
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[/fusion_toggle][fusion_toggle title=”Question 46 : Does garbage collection in Java guarantee that a program will not run out of memory?” open=”no” class=”” id=””]
Answer:
No, Java garbage collection does not guarantee that a program will not run out of memory. The central objective of garbage collection is to identify & discard those objects that are no longer required by the Java program so that their resources can be reused & reclaimed. An object needs to garbage collected when it is unreachable to the Java program. If there is insufficient memory required for a new object, then the garbage collector attempts to reclaim its memory by releasing the memory used by the objects with no references. However, if there’s still insufficient memory, the program will throw an ‘out of memory’ exception.
[/fusion_toggle][fusion_toggle title=”Question 47 : What restrictions are placed on a package statement’s location within a source code file?” open=”no” class=”” id=””]
Answer:
A package statement is confined to appear as the first line in a source code file (excluding blank comments & lines).
[/fusion_toggle][fusion_toggle title=”Question 48 : Can garbage collector invoke the finalize() method of an object while it is reachable?” open=”no” class=”” id=””]
Answer:
No, it is impossible to invoke the finalize() method of an object while it is reachable. However, the finalize() method may get invoked by other objects.
[/fusion_toggle][fusion_toggle title=”Question 49 : What is the difference between time slicing & preemptive scheduling?” open=”no” class=”” id=””]
Answer:
- Preemptive scheduling: Under this, the highest priority task gets executed until it enters the dead states or a higher priority task comes into existence.
- Time slicing: Under this, a task gets executed for a predefined slice of time, then reenters the pool of ready tasks. Thereby, the scheduler decides which task should be executed next, based on priority and various other factors.
[/fusion_toggle][fusion_toggle title=”Question 50 : What is clipping in Java?” open=”no” class=”” id=””]
Answer:
Clipping refers to the process of confining paint operations to a limited shape or area. When displaying a large portion of a picture, certain parts of the image are inside, while the others are partially visible. The elements or lines that are partly visible need to be omitted, so we use clipping to decide the visible-invisible portion. Thereon, the visible part is selected & the invisible part is discarded.
[/fusion_toggle][fusion_toggle title=”Question 51 : What is a native method in Java?” open=”no” class=”” id=””]
Answer:
A native method is a method whose implementation is written in other languages such as C++ & C. The ‘native’ keyword is used before a method indicates that it is implemented in another language.
[/fusion_toggle][fusion_toggle title=”Question 52 : Can a “for statement” loop indefinitely?” open=”no” class=”” id=””]
Answer:
Yes, the “for statement” can loop indefinitely.
[/fusion_toggle][fusion_toggle title=”Question 53 : What is the order of precedence & associativity? How are they used?” open=”no” class=”” id=””]
Answer:
The order of precedence in Java determines the order of evaluating the operators in expressions. The order of associativity determines the evaluation of operators with the same precedence.
[/fusion_toggle][fusion_toggle title=”Question 54 : What is a task’s priority & how to use it in scheduling?” open=”no” class=”” id=””]
Answer:
A task’s priority in Java is an integer value that determines the relative order, wherein it needs to executed with respect to other tasks. The scheduler first schedules higher priority tasks & later schedules lower priority tasks.
[/fusion_toggle][fusion_toggle title=”Question 55 : What class is the highest of the AWT event hierarchy?” open=”no” class=”” id=””]
Answer:
The java.awt.AWTEvent class is the top class in the AWT event hierarchy.
[/fusion_toggle][fusion_toggle title=”Question 56 : What is the initial stage of a thread after it has been created & started?” open=”no” class=”” id=””]
Answer:
The initial state of a thread is the “Ready” state after it has been started & created; that stage signifies the thread is ready for task execution; thereon, it can be running.
[/fusion_toggle][fusion_toggle title=”Question 57 : What is the primary purpose of finalization?” open=”no” class=”” id=””]
Answer:
The central purpose of finalization is to allow an unreachable object to perform a cleanup processing before the object’s garbage collection.
[/fusion_toggle][fusion_toggle title=”Question 58 : What is the key difference between Boolean & operator and Boolean && operator?” open=”no” class=”” id=””]
Answer:
Both the “&” and “&&” operators are used to evaluate the conditional statements. The & operator is a bitwise operator, while && is a logical operator. The fundamental difference between the & and the && operator is that the former evaluates both sides of the expression. On the other hand, the latter evaluates only the left side of the expression to acquire final results. [fusion_table fusion_table_type=”1″ fusion_table_rows=”” fusion_table_columns=”” hide_on_mobile=”small-visibility,medium-visibility,large-visibility” class=”” id=”” animation_type=”” animation_direction=”left” animation_speed=”0.3″ animation_offset=””]
| Basis of Comparison | & | && |
|---|---|---|
| Operator | & is a Bitwise Operator. | && is a Logical Operator |
| Evaluation | & operator evaluates both right & the left side of an expression. | && only evaluates the left side of an expression. |
| Operates on | & operates on “Boolean datatype” & “bits”. | && only operates on “Boolean datatype.” |
| Use | && operator is used to check the logical condition and mask off certain bits like parity bits. | && operator is only used to check logical conditions. |
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[/fusion_toggle][fusion_toggle title=”Question 59 : What is the Gregorian Calendar class?” open=”no” class=”” id=””]
Answer:
Gregorian Calendar class provides an implementation of the abstract Calendar class. It renders us multiple methods to access & manipulate the current minute, second, hour, day of the week, week of the year, etc.
[/fusion_toggle][fusion_toggle title=”Question 60 : Which Container method is used to cause a container to be laid out and redisplayed?” open=”no” class=”” id=””]
Answer:
validate() method causes a container to be laid out & redisplayed in Java.
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