Which Resource Loading Method is Best in Java?

Preferred Method for Resource Loading in Java

Programmers working with Java may encounter various options for loading resources, leading to questions regarding the most efficient approach. Three commonly employed methods are:

• this.getClass().getResource() (or getResourceAsStream())
• Thread.currentThread().getContextClassLoader().getResource(name)
• System.class.getResource(name)

To determine the optimal approach, it's essential to consider the class loader and starting location involved in each method.

this.getClass().getResource()

This method loads a resource using the class loader of the class it's called upon. It searches for the resource within the same package as the calling class. By prepending a "/", you can refer to the resource absolutely.

Thread.currentThread().getContextClassLoader().getResource(name)

This method loads a resource using the context class loader. However, it doesn't resolve the resource name according to any specific package, and the resource must be referenced absolutely.

System.class.getResource(name)

This method loads a resource using the system class loader. It also requires an absolute reference to the resource and cannot be used to load resources from the java.lang package (where System is located).

Ultimately, the best method depends on the specific requirements. For loading resources relative to the calling class, this.getClass().getResource() is preferred. For absolute resource references, Thread.currentThread().getContextClassLoader().getResource(name) can be used. For resources loaded from the system class loader, System.class.getResource(name) is appropriate.

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