On the failure of synchronized Lock

topic description

I use synchronized to lock the loop statement. It can be locked if the number of loops is less than 400. if it is more than 400, it cannot be locked. what is the reason for this?

related codes

    private void createThread(){
        thread1=new Thread1();
        thread2=new Thread1();
        thread1.start();
        thread2.start();
    }

    class Thread1 extends Thread{
        @Override
        public synchronized void run() {
            super.run();
            for(int i=0;i<500;iPP){
                MainTool.log(Thread.currentThread().getName()+":"+i);
            }
        }
    }

error display

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Dec.29,2021

I don't see any errors in the results. Where do you think there are errors in the output?

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b4298f-4f28b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b4298f-4f28b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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