多线程 中断

突然想起一个问题，多线程中，同一个对象方法的执行是怎样的，后来写了一个测试。

服务类

public class ThreadTestService {


	public void onLogic(Object t) {
		if(t.toString().equals("12")) {
			int step = 0;
			double a = 2;
			while(step <500) {
				step++;
				a++;
				System.out.print(t+":"+a);
			}
			System.out.println();
		}
		System.out.println(t);
	}
}

		final ThreadTestService service = new ThreadTestService();
		
		for(int i = 0; i< 10 ;i++) {
			Thread thread= new Thread(){
					public void run() {
						service.onLogic(this.currentThread().getId());
					}
				};
			thread.start();
		};

在上面的代码中，声明了一个对象，用多线程进行了多次调用，碰到线程号为12的进行复杂处理，加长处理时间，运行结果如下：

9
10
12:3.012:4.012:5.012:6.012:7.012:8.012:9.012:10.012:11.012:12.012:13.012:14.012:15.012:16.012:17.012:18.012:19.012:20.012:21.012:22.012:23.012:24.012:25.012:26.012:27.012:28.012:29.012:30.012:31.012:32.012:33.012:34.012:35.012:36.012:37.012:38.012:39.012:40.012:41.012:42.012:43.012:44.012:45.012:46.012:47.012:48.012:49.012:50.012:51.012:52.012:53.012:54.012:55.012:56.012:57.012:58.012:59.012:60.012:61.012:62.012:63.012:64.012:65.012:66.012:67.011
12:68.012:69.012:70.013
12:71.012:72.012:73.012:74.012:75.012:76.012:77.012:78.012:79.012:80.015
14
17
16
18
12:81.012:82.012:83.012:84.012:85.012:86.012:87.012:88.012:89.012:90.012:91.012:92.012:93.012:94.012:95.012:96.012:97.012:98.012:99.012:100.012:101.012:102.012:103.012:104.012:105.012:106.012:107.012:108.012:109.012:110.012:111.012:112.012:113.012:114.012:115.012:116.012:117.012:118.012:119.012:120.012:121.012:122.012:123.012:124.012:125.012:126.012:127.012:128.012:129.012:130.012:131.012:132.012:133.012:134.012:135.012:136.012:137.012:138.012:139.012:140.012:141.012:142.012:143.012:144.012:145.012:146.012:147.012:148.012:149.012:150.012:151.012:152.012:153.012:154.012:155.012:156.012:157.012:158.012:159.012:160.012:161.012:162.012:163.012:164.012:165.012:166.012:167.012:168.012:169.012:170.012:171.012:172.012:173.012:174.012:175.012:176.012:177.012:178.012:179.012:180.012:181.012:182.012:183.012:184.012:185.012:186.012:187.012:188.012:189.012:190.012:191.012:192.012:193.012:194.012:195.012:196.012:197.012:198.012:199.012:200.012:201.012:202.012:203.012:204.012:205.012:206.012:207.012:208.012:209.012:210.012:211.012:212.012:213.012:214.012:215.012:216.012:217.012:218.012:219.012:220.012:221.012:222.012:223.012:224.012:225.012:226.012:227.012:228.012:229.012:230.012:231.012:232.012:233.012:234.012:235.012:236.012:237.012:238.012:239.012:240.012:241.012:242.012:243.012:244.012:245.012:246.012:247.012:248.012:249.012:250.012:251.012:252.012:253.012:254.012:255.012:256.012:257.012:258.012:259.012:260.012:261.012:262.012:263.012:264.012:265.012:266.012:267.012:268.012:269.012:270.012:271.012:272.012:273.012:274.012:275.012:276.012:277.012:278.012:279.012:280.012:281.012:282.012:283.012:284.012:285.012:286.012:287.012:288.012:289.012:290.012:291.012:292.012:293.012:294.012:295.012:296.012:297.012:298.012:299.012:300.012:301.012:302.012:303.012:304.012:305.012:306.012:307.012:308.012:309.012:310.012:311.012:312.012:313.012:314.012:315.012:316.012:317.012:318.012:319.012:320.012:321.012:322.012:323.012:324.012:325.012:326.012:327.012:328.012:329.012:330.012:331.012:332.012:333.012:334.012:335.012:336.012:337.012:338.012:339.012:340.012:341.012:342.012:343.012:344.012:345.012:346.012:347.012:348.012:349.012:350.012:351.012:352.012:353.012:354.012:355.012:356.012:357.012:358.012:359.012:360.012:361.012:362.012:363.012:364.012:365.012:366.012:367.012:368.012:369.012:370.012:371.012:372.012:373.012:374.012:375.012:376.012:377.012:378.012:379.012:380.012:381.012:382.012:383.012:384.012:385.012:386.012:387.012:388.012:389.012:390.012:391.012:392.012:393.012:394.012:395.012:396.012:397.012:398.012:399.012:400.012:401.012:402.012:403.012:404.012:405.012:406.012:407.012:408.012:409.012:410.012:411.012:412.012:413.012:414.012:415.012:416.012:417.012:418.012:419.012:420.012:421.012:422.012:423.012:424.012:425.012:426.012:427.012:428.012:429.012:430.012:431.012:432.012:433.012:434.012:435.012:436.012:437.012:438.012:439.012:440.012:441.012:442.012:443.012:444.012:445.012:446.012:447.012:448.012:449.012:450.012:451.012:452.012:453.012:454.012:455.012:456.012:457.012:458.012:459.012:460.012:461.012:462.012:463.012:464.012:465.012:466.012:467.012:468.012:469.012:470.012:471.012:472.012:473.012:474.012:475.012:476.012:477.012:478.012:479.012:480.012:481.012:482.012:483.012:484.012:485.012:486.012:487.012:488.012:489.012:490.012:491.012:492.012:493.012:494.012:495.012:496.012:497.012:498.012:499.012:500.012:501.012:502.0
12
一看结果（黑体，标识一次线程执行结束），才想起，线程中断会保护现场，下次执行时，会寻找中断地址，继续往下执行。
对象的方法是存放于类似操作系统内存的代码区（jvm应该是在堆栈中分出了代码区），
需要研究一下JVM规范