测试循环依赖

构造函数的引入会造成循环依赖

import org.springframework.stereotype.Component;
/**
 * @author tn
 * @version 1
 * @ClassName Sa
 * @description 测试A
 * @date 2020/11/13 11:23
 */
@Component
public class Sa {
    private Sb sb;
    public Sa(Sb sb) {
        this.sb = sb;
    }
}
import org.springframework.stereotype.Component;
/**
 * @author tn
 * @version 1
 * @ClassName Sb
 * @description 测试B
 * @date 2020/11/13 11:23
 */
@Component
public class Sb {
    private Sc sc;
    public Sb(Sc sc) {
        this.sc = sc;
    }
}
import org.springframework.stereotype.Component;
/**
 * @author tn
 * @version 1
 * @ClassName Sc
 * @description 测试C
 * @date 2020/11/13 11:23
 */
@Component
public class Sc {
    private Sa sa;
    public Sc(Sa sa) {
        this.sa = sa;
    }
}
Description:
The dependencies of some of the beans in the application context form a cycle:
┌─────┐
|  sa defined in file [D:\project\java\my\test\stest\loop_1\target\classes\com\tn\loop_1\test\Sa.class]
↑     ↓
|  sb defined in file [D:\project\java\my\test\stest\loop_1\target\classes\com\tn\loop_1\test\Sb.class]
↑     ↓
|  sc defined in file [D:\project\java\my\test\stest\loop_1\target\classes\com\tn\loop_1\test\Sc.class]
└─────┘
Process finished with exit code 1

使用 注解 就不会出现循环依赖，但是使用时可能会报错（下面的例子，会疯狂的互相调用）

package com.tn.loop_1.test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
/**
 * @author tn
 * @version 1
 * @ClassName Sa
 * @description 测试A
 * @date 2020/11/13 11:23
 */
@Component
public class Sa1 {
    @Autowired
    private Sb1 sb1;
    public void print(){
        System.out.println("测试A");
        sb1.print();
    }
}
package com.tn.loop_1.test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
/**
 * @author tn
 * @version 1
 * @ClassName Sb
 * @description 测试B
 * @date 2020/11/13 11:23
 */
@Component
public class Sb1 {
    @Autowired
    private Sc1 sc1;
    public void print(){
        System.out.println("测试B");
        sc1.print();
    }
}
package com.tn.loop_1.test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
/**
 * @author tn
 * @version 1
 * @ClassName Sc
 * @description 测试C
 * @date 2020/11/13 11:23
 */
@Component
public class Sc1 {
    @Autowired
    private Sa1 sa1;
    public void print(){
        System.out.println("测试C");
        sa1.print();
    }
}