// 实际开发中常用的方法
　　　　　　　　　Intent intent = new Intent();

                intent.setClass(MainActivity.this, LoginActivity.class);

                startActivity(intent);

               //<疯狂Android>中介绍的方法 
　　　　　　　　　ComponentName comp = new ComponentName(MainActivity.this, FullscreenActivity02.class);

                Intent intent = new Intent();

                intent.setComponent(comp);

                startActivity(intent);

        // 数据打包

        Bundle bdl = new Bundle();

        bdl.putString("name", "A");

        bdl.putInt("years", 17);

        // 跳界传参

        Intent itt_1 = new Intent(this, A01_Activity.class);

        itt_1.putExtras(bdl);

        // 起跳

        startActivity(itt_1);

//-----------------------------------------------------------------

        // Intent->Bundle->取值

        Intent itt_2 = getIntent();

        Bundle dbl = itt_2.getExtras();

        String str = dbl.getString("name");

        int n = dbl.getInt("years");

        System.out.println(str + "●<--------------------->●" + n);

        // 跳界传参

        Intent itt_1 = new Intent(this, A01_Activity.class);

        itt_1.putExtra("name", "A");

        itt_1.putExtra("years", 18);

        // 起跳

        startActivity(itt_1);

//-------取值的地方是一样的-------------------------------------------------------------------

        // Intent->Bundle->取值

        Intent itt_2 = getIntent();

        Bundle dbl = itt_2.getExtras();

        String str = dbl.getString("name");

        int n = dbl.getInt("years");