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Solve the problem of outputting exceptions in Java execution of SQL*Plus commands

This article discusses in depth the issue that when Java programs execute SQLPlus commands through Runtime.exec(String), they cannot obtain the expected database output, but instead displays the SQLPlus usage help information. The core reason is the parsing defect of Runtime.exec(String) on complex command strings. The article provides detailed solutions, including using Runtime.exec(String[]) and the more recommended ProcessBuilder class to accurately pass command parameters, ensuring that the SQLPlus command is correctly parsed and executed, so as to obtain the correct output, and is accompanied by sample code and precautions.

Aug 04, 2025 pm 06:39 PM

Detailed explanation and solution for the problem of inconsistent output of SQLPlus commands in Java

This article discusses in depth the issue of inconsistent output when executing SQLPlus commands through Runtime.exec(String) in Java. The core reason is that Java improperly parses complex command strings. The article provides a solution to correctly pass command parameters using Runtime.exec(String[]) and the more recommended ProcessBuilder, and emphasizes the importance of properly handling process input and output streams to ensure that the commands execute as expected and capture the full output.

Aug 04, 2025 pm 06:36 PM

Troubleshooting and solution for output exceptions by calling SQLPlus command in Java

This article discusses the problem that the output does not match expectations when executing SQLPlus commands through Runtime.exec(String) in Java applications. The main reason is that Runtime.exec(String) improperly parses command strings containing complex parameters such as spaces and quotes. The article provides two solutions: passing command parameters as an array using Runtime.exec(String[]), and the more recommended ProcessBuilder class, which provides finer process control and standard flow management to ensure that commands are executed correctly and capture the expected output.

Aug 04, 2025 pm 06:30 PM

JFormattedTextField Accurate acquisition and verification of input content length

When using JFormattedTextField to work with MaskFormatter for data input, the string length directly obtained through the getText() method often contains formatted mask characters (such as brackets, spaces, hyphens, etc.), which makes it impossible to accurately determine the number of characters actually entered by the user. This article will introduce two effective methods in detail, removing these mask characters through string processing, thereby obtaining the accurate length of the user's actual input content, and performing effective data verification to ensure the legality of the input.

Aug 04, 2025 pm 06:12 PM

Solve the problem of default value when the Lombok Boolean field is missing in Jackson

This article explores the issue that when using Jackson for JSON deserialization, the Boolean type field in the Lombok generated class defaults to null instead of false when missing in JSON. By comparing the Boolean wrapper types and the boolean primitive types, the article elaborates on how to effectively solve this problem by changing the field type from Boolean to boolean, and provides sample code and best practice suggestions to ensure that the default value of the field is false when missing in JSON.

Aug 04, 2025 pm 05:54 PM

Static blocks

Definition: A static block is a piece of code executed by jvm when the class is first loaded. Used to initialize static variables or perform tasks that need to be completed before class use. Purpose: Can be used to perform important initializations, such as establishing a connection or calculating initial values. It is useful for preparing classes before creating any instance or before calling a static method. Execution: A static block is executed only once after the class is loaded, before any other code associated with the class. Even if an object of the class is not created, it will be executed. Code example with static blocks: static block.java//UsaumblocoestáticoclassStaticBlock{staticdoublerootOf2;staticdoublerootOf3

Aug 04, 2025 pm 05:51 PM

Sort the given LinkedList

Question Note: The sort() method can be used to merge into sorted linked list/***Definitionforsingly-linkedlist.*publicclassListNode{*intval;*ListNodenext;*ListNode(){}*ListNode(intval){this.val=val;}*ListNode(intval,ListNodenext){this.val=val;this.next=next;}*}*/classSolution{publicListNodesortList(L

Aug 04, 2025 pm 05:48 PM

Java

What is Java? Java is a programming language and a platform. Java is a high-level, robust, object-oriented and secure programming language. Java was developed in 1995 by SunMicrosystems, now a subsidiary of Oracle. James Gosling is known as the father of Java. Before Java, its name was Oak. Since Oak is already a registered company, James Gosling and his team changed the name from Oak to Java. Platform: Any hardware or software environment in which a program runs is called a platform. Because Java has runtime environment (JRE) and API, it is called a platform. According to Sun, there are 3 billion units

Aug 04, 2025 pm 05:33 PM

Advanced Java Debugging Techniques in IntelliJ IDEA

Useconditionalbreakpointstopauseexecutiononlywhenspecificconditionsaremet,reducingunnecessarystopsinloopsorfrequentmethodcalls.2.Evaluateexpressionsontheflyduringadebugsessiontoinspectormodifystate,testedgecases,orinvokemethodswithoutalteringcode.3.S

Aug 04, 2025 pm 01:06 PM

java debug

How to join an array of strings in Java?

Using String.join() (Java8) is the easiest recommended method for connecting string arrays, just specify the separator directly; 2. For old versions of Java or when more control is needed, you can use StringBuilder to manually traverse and splice; 3. StringJoiner is suitable for scenarios that require more flexible formats such as prefixes and suffixes; 4. Using Arrays.stream() combined with Collectors.joining() is suitable for filtering or converting the array before joining; To sum up, if Java8 and above is used, the String.join() method should be preferred in most cases, which is concise and easy to read, but for complex logic, it is recommended.

Aug 04, 2025 pm 12:55 PM

java string array

Comparing Java Frameworks: Spring Boot vs Quarkus vs Micronaut

Pre-formanceTartuptimeMoryusage, Quarkusandmicronautleadduetocompile-Timeprocessingandgraalvsupport, Withquarkusoftenperforminglightbetterine ServerLess scenarios.2.Thyvelopecosyste,

Aug 04, 2025 pm 12:48 PM

java frame

Mastering Object-Oriented Programming Concepts in Java

ThefourpillarsofOOPinJavaareencapsulation,inheritance,polymorphism,andabstraction;1.Encapsulationinvolvesbundlingdataandmethodswithinaclassandrestrictingaccessusingmodifierslikeprivatetoprotectinternalstate;2.Inheritanceallowsaclasstoinheritfieldsand

Aug 04, 2025 pm 12:21 PM

Java vs Python for Backend Development: A Detailed Comparison

Systems with high performance requirements, such as Java for financial transactions, Python for lightweight services; 2. Python has high development efficiency, suitable for MVP, Java is suitable for large-scale team collaboration; 3. Java is mature in the Java enterprise-level ecosystem, and the Python framework is light, especially FastAPI is outstanding; 4. Java is the first choice for high-concurrency distributed systems, and Python requires asynchronous models to improve performance; 5. Python has a smooth learning curve, and a wide range of talents, and Java has sufficient reserves of enterprise-level talents; 6. Python is suitable for cloud-native lightweight deployment, and Java is more stable in traditional operation and maintenance; the final choice should be combined with the team's technology stack, project cycle, performance requirements, integration complexity and operation and maintenance costs, and the key is to use the right scenario.

Aug 04, 2025 am 11:57 AM

python java

How to configure a Hibernate application in Java?

AddHibernateanddatabasedriverdependenciesinpom.xml;2.Createhibernate.cfg.xmlwithdatabaseconnectionandHibernatesettings;3.DefineaJPA-annotatedentityclasslikeUser;4.ImplementHibernateUtiltoinitializeSessionFactory;5.UseSessionandTransactioninyourapplic

Aug 04, 2025 am 11:56 AM