Recent questions tagged java

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java - Difference between String.length() and String.getBytes().length

I am beginner and self-learning in Java programming. So, I want to know about difference between String.length() ... the length of the string? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Changing value after it's placed in HashMap changes what's inside HashMap?

If I create a new HashMap and a new List, and then place the List inside the Hashmap with some arbitrary ... the original object placed? Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Javadoc comments vs block comments?

When is it appropriate to use a block comment at the beginning of methods, and when is it appropriate to ... specifications I link to above. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to get all table names in android sqlite database?

I have tried this code Cursor c=db.rawQuery("SELECT name FROM sqlite_master WHERE type = 'table'",null); c. ... to fetch all the table names? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - What is the Iterable interface used for?

I am a beginner and I cannot understand the real effect of the Iterable interface. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Why does notifyAll() raise IllegalMonitorStateException when synchronized on Integer?

Why does this test program result in a java.lang.IllegalMonitorStateException? public class test { static Integer foo = ... .main(test.java:6) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Best way to convert Locale specific String to BigDecimal

I have to convert a German locale formatted String to a BigDecimal. However, I'm struggling with the best solution. ... better ways to do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Setting -XX:+DisableExplicitGC in production: what could go wrong?

we just had a meeting to address some performance issues in a web application that is used to calculate insurance ... any other hazards ahead? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Type safety: Unchecked cast from Object

I try to cast an object to my Action class, but it results in a warning: Type safety: Unchecked cast from Object ... ..] Thank you for any help See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Why should I specify @Column( nullable = false )?

I have an entity annotated with @Entity. If I am responsible for creating the CREATE TABLE scripts why should I ... this property in a field? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - JRockit JVM versus HotSpot JVM

If anyone can give me brief information about the advantages and disadvantages of the two JVM since they all ... the Standard JVM Specification. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - retrofit 2.0 how to print the full json response?

I am moving from Volley to Retrofit currently version 2.0. How to print the the full json response code ? includes: ... t.toString()); } }); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Does Maven support incremental builds?

How does one use Maven to support incremental builds? Is there a guide somewhere? (top Google results are disappointing) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - When to flush a BufferedWriter

In a Java program (Java 1.5), I have a BufferedWriter that wraps a Filewriter, and I call write() many many ... appear in the results file... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to set the charset with JAX-RS?

How can I set the charset with JAX-RS? I've tried @Produces("text/html; charset=UTF-8") but ... @Produces annotation via reflection by myself. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Why am I getting a ClassCastException when generating javadocs?

I'm using ant to generate javadocs, but get this exception over and over - why? I'm using JDK version 1.6 ... .javadoc.Main.main(Main.java:31) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to get row count in an Excel file using POI library?

Guys I'm currently using the POI 3.9 library to work with excel files. I know of the getLastRowNum() function, ... Excel file is empty or not ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Unconditional layout, inflation from view adapter: Should use View Holder pattern

I am getting following warning in eclipse: Unconditional layout inflation from view adapter: Should use View Holder ... this yet? Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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333 views

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java - String replaceAll() vs. Matcher replaceAll() (Performance differences)

Pretty simple question, but this is coming from a C/C++ person getting into the intricacies of Java. I ... strings, making coffee etc.) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to concat two ArrayLists?

I have two ArrayLists of equal size. List 1 consists of 10 names and list 2 consists of their phone numbers. I ... ArrayList. How do I do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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814 views

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java - Convert between LocalDate and XMLGregorianCalendar

What's the best way to convert between LocalDate from Java 8 and XMLGregorianCalendar? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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514 views

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java - package javax.mail and javax.mail.internet do not exist

When I compile a simple code that has the following 2 import statements: import javax.mail.* import javax.mail.internet. ... exc) { } } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Using Mockito, how do I verify a method was a called with a certain argument?

I'm using Mockito 1.9.0. How would i verify that a method got called exactly once, and that one of the fields ... and I'm happy to do so. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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281 views

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java - Convert JSONObject to Map

I have a JSONObject with some attributes that I want to convert into a Map<String, Object> Is there something ... the json.org or ObjectMapper? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Maven shade plugin adding dependency-reduced-pom.xml to base directory

The maven shade plugin is creating a file called dependency-reduced-pom.xml and also artifactname-shaded.jar and ... directory. Any workaround? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Highlight exception throwers in IntelliJ IDEA

I recently moved from Eclipse to IntelliJ IDEA, and there is a feature that I'm missing. In Eclipse, ... IntelliJ IDEA (Community edition)? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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165 views

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java - IntelliJ Static Import Completion

In Eclipse I was able to register a set of classes for static import auto-completion, e.g. Math., Assert., ... exist. Can anyone help? Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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225 views

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java - Seemingly endless loop terminates, unless System.out.println is used

I had a simple bit of code that was supposed to be an endless loop since x will always be growing and will ... behaves as expected? Confused :) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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