Java - 两个类互相组合嵌套引用会爆炸吗？

package tech.luxsun.interview.luxinterviewstarter.demo;
import java.time.LocalDateTime;
public class Demo3 {
    private String sex;
    private String name;
    private Demo2 demo2;
    public Demo3(String sex, String name) {
        this.sex = sex;
        this.name = name;
    }
    public Demo3() {
    }
    public Demo2 getDemo2() {
        return demo2;
    }
    public void setDemo2(Demo2 demo2) {
        this.demo2 = demo2;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    @Override
    public String toString() {
        return "Demo3{" +
                "sex='" + sex + '\'' +
                ", name='" + name + '\'' +
                ", demo2=" + demo2 +
                '}';
    }
}

package tech.luxsun.interview.luxinterviewstarter.demo;
public class Demo2 {
    private String sex;
    private String name;
    private Demo3 demo3;
    public Demo2() {
    }
    public Demo3 getDemo3() {
        return demo3;
    }
    public void setDemo3(Demo3 demo3) {
        this.demo3 = demo3;
    }
    public Demo2(String sex, String name) {
        this.sex = sex;
        this.name = name;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public static void main(String[] args) {
        Demo2 demo2 = new Demo2();
        demo2.setName("Bob");
        demo2.setSex("男");
        Demo3 demo3 = new Demo3();
        demo3.setName("Alice");
        demo3.setSex("女");
        demo2.setDemo3(demo3);
        demo3.setDemo2(demo2);
        System.out.println(demo2.toString());
        System.out.println(demo3.getDemo2());
    }
    @Override
    public String toString() {
        return "Demo2{" +
                "sex='" + sex + '\'' +
                ", name='" + name + '\'' +
                ", demo3=" + demo3 +
                '}';
    }
}

Exception in thread "main" java.lang.StackOverflowError
  at java.lang.StringBuilder.append(StringBuilder.java:136)
  at tech.luxsun.interview.luxinterviewstarter.demo.Demo2.toString(Demo2.java:58)
  at java.lang.String.valueOf(String.java:2994)
  at java.lang.StringBuilder.append(StringBuilder.java:131)
  at tech.luxsun.interview.luxinterviewstarter.demo.Demo3.toString(Demo3.java:44)
  at java.lang.String.valueOf(String.java:2994)
  at java.lang.StringBuilder.append(StringBuilder.java:131)
    ……

Demo2{sex='男', name='Bob', demo3=tech.luxsun.interview.luxinterviewstarter.demo.Demo3@19469ea2}
Demo2{sex='男', name='Bob', demo3=tech.luxsun.interview.luxinterviewstarter.demo.Demo3@19469ea2}