多個線程對hashmap進行put操作的異常

Exception in thread "Thread-0" java.lang.ClassCastException: java.util.HashMap$Node cannot be cast to java.util.HashMap$TreeNodeat java.util.HashMap$TreeNode.moveRootToFront(HashMap.java:1832)at java.util.HashMap$TreeNode.treeify(HashMap.java:1949)at java.util.HashMap$TreeNode.split(HashMap.java:2175)at java.util.HashMap.resize(HashMap.java:714)at java.util.HashMap.putVal(HashMap.java:663)at java.util.HashMap.put(HashMap.java:612)at com.stono.thread3.page313.Thread1A.run(Thread1A.java:17)

源碼：

package com.stono.thread3.page313;import java.util.HashMap;public class MyService1 {public HashMap<String, String> map = new HashMap<>(); } package com.stono.thread3.page313;import com.stono.thread3.CusPrint;public class Thread1A extends Thread {private MyService1 service1;public Thread1A(MyService1 service1) {super();this.service1 = service1;}@Overridepublic void run() {for(int i=0;i<50000;i++) {service1.map.put("ThreadA"+(i+1), "ThreadA"+(i+1));CusPrint.print("ThreadA"+(i+1));}} } package com.stono.thread3.page313;import com.stono.thread3.CusPrint;public class Thread1B extends Thread {private MyService1 service1;public Thread1B(MyService1 service1) {super();this.service1 = service1;}@Overridepublic void run() {for(int i=0;i<50000;i++) {service1.map.put("ThreadB"+(i+1), "ThreadB"+(i+1));CusPrint.print("ThreadB"+(i+1));}} } package com.stono.thread3.page313;public class Test1_2 {public static void main(String[] args) {MyService1 service1 = new MyService1();Thread1A a = new Thread1A(service1);Thread1B b = new Thread1B(service1);a.start();b.start();}}

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