线程名称求答疑？？？？

mian方法进行测试，测试代码1

import java.util.ArrayList;

import cn.chinaunicom.thread.com.TestThread;

public class TestFor {
  
 public static void main(String[] args) {
  
  TestThread tt = new TestThread();
  Thread thread1 = new Thread(tt,"测试线程一");
  Thread thread2 = new Thread(tt,"测试线程二");
  thread1.start();
  thread2.start(); 
 }

}

测试代码2

public class TestThread extends Thread{
 
 @Override
 public void run() {
  for (int i = 0; i < 10; i++) {
   if (i==3) {
    try {
     if(Thread.currentThread().getName()== "测试线程一"){
                     System.out.println(true);
     }
     Thread.sleep(5000);
    } catch (InterruptedException e) {
     e.printStackTrace();
    }
   }
   System.out.println(Thread.currentThread().getName()+"出厂顺序"+i); 
  }
 }

}

求解：运行代码1时候，测试代码2中加粗的代码没有执行的原因？？？？