Spring injection thinking

Modify the problems encountered by the utility class

Q1: How to inject static member variables?

public class ExampleUtil {
 
        private static ExampleClass1 exampleClass1;

	@Autowired
	private ExampleClass2 exampleClass2;

	@Autowired
	private ExampleClass3 exampleClass3;
    
        private static ExampleUtil exampleUtil;

}
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A1: set injection

        @Autowired
	public void setExampleClass1(ExampleClass1 exampleClass1){
		ExampleUtil.exampleClass1=exampleClass1;
	}
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Q2: How is exampleUtil initialized?

A2: using the @ PostConstruct

       @PostConstruct
	public void init(a) {
	    exampleUtil = this;
        // The member variable needs to be reassigned
	    exampleUtil.exampleClass2 = this.exampleClass2;
	}
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reference

@postconstruct annotation usage