Add some code into Build.java in cm10.1 but build false - Android Q&A, Help & Troubleshooting

HI, everybody,i am a new guy about this topic,
Recently i want to add some feature into android code,and i using cm10.1 source code;
i have add some code into Build.java in /system/frameworks/base/core/java/android/os,But buding false.
Does any body want how to solve this? Thanks.
frameworks/base/core/java/android/os/Build.java:471: cannot find symbol
symbol : class Properties
location: class android.os.Build
private static Properties p;
^
frameworks/base/core/java/android/os/Build.java:473: cannot find symbol
symbol : class File
location: class android.os.Build
File f=new File("/system/build.prop");
^
frameworks/base/core/java/android/os/Build.java:473: cannot find symbol
symbol : class File
location: class android.os.Build
File f=new File("/system/build.prop");
^
frameworks/base/core/java/android/os/Build.java:475: cannot find symbol
symbol : class FileInputStream
location: class android.os.Build
FileInputStream fis=new FileInputStream(f);
^
frameworks/base/core/java/android/os/Build.java:475: cannot find symbol
symbol : class FileInputStream
location: class android.os.Build
FileInputStream fis=new FileInputStream(f);
^
frameworks/base/core/java/android/os/Build.java:483: cannot find symbol
symbol : class Properties
location: class android.os.Build
p = new Properties();
^
frameworks/base/core/java/android/os/Build.java:492: cannot find symbol
symbol : class FileNotFoundException
location: class android.os.Build
} catch (FileNotFoundException e) {
^
frameworks/base/core/java/android/os/Build.java:495: cannot find symbol
symbol : class IOException
location: class android.os.Build
} catch (IOException e) {
^
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
8 errors
make: *** [/home/admini/android/system/out/target/common/obj/JAVA_LIBRARIES/framework_intermediates/classes-full-debug.jar] Error 41
make: *** Waiting for unfinished jobs....
GEN /home/admini/android/system/out/target/product/maguro/obj/KERNEL_OBJ/Makefile
CHK include/linux/version.h
Using /home/admini/android/system/kernel/samsung/tuna as source for kernel
CHK include/generated/utsrelease.h
make[3]: `include/generated/mach-types.h' is up to date.
CALL /home/admini/android/system/kernel/samsung/tuna/scripts/checksyscalls.sh
CHK include/generated/compile.h
Kernel: arch/arm/boot/Image is ready
SHIPPED arch/arm/boot/compressed/lib1funcs.S
AS arch/arm/boot/compressed/lib1funcs.o
LD arch/arm/boot/compressed/vmlinux
OBJCOPY arch/arm/boot/zImage
Kernel: arch/arm/boot/zImage is ready
make[1]: Leaving directory `/home/admini/android/system/kernel/samsung/tuna'
make -C kernel/samsung/tuna O=/home/admini/android/system/out/target/product/maguro/obj/KERNEL_OBJ ARCH=arm CROSS_COMPILE=" /home/admini/android/system/prebuilts/gcc/linux-x86/arm/arm-eabi-4.6/bin/arm-eabi-" modules
make[1]: Entering directory `/home/admini/android/system/kernel/samsung/tuna'
GEN /home/admini/android/system/out/target/product/maguro/obj/KERNEL_OBJ/Makefile
CHK include/linux/version.h
Using /home/admini/android/system/kernel/samsung/tuna as source for kernel
CHK include/generated/utsrelease.h
make[3]: `include/generated/mach-types.h' is up to date.
CALL /home/admini/android/system/kernel/samsung/tuna/scripts/checksyscalls.sh
Building modules, stage 2.
MODPOST 4 modules
make[1]: Leaving directory `/home/admini/android/system/kernel/samsung/tuna'
make -C kernel/samsung/tuna O=/home/admini/android/system/out/target/product/maguro/obj/KERNEL_OBJ INSTALL_MOD_PATH=../../system ARCH=arm CROSS_COMPILE=" /home/admini/android/system/prebuilts/gcc/linux-x86/arm/arm-eabi-4.6/bin/arm-eabi-" modules_install
make[1]: Entering directory `/home/admini/android/system/kernel/samsung/tuna'
INSTALL crypto/ansi_cprng.ko
INSTALL drivers/rpmsg/rpmsg_client_sample.ko
INSTALL drivers/rpmsg/rpmsg_server_sample.ko
INSTALL drivers/scsi/scsi_wait_scan.ko
DEPMOD 3.0.31-cyanogenmod-g9c74909
make[1]: Leaving directory `/home/admini/android/system/kernel/samsung/tuna'
mdpath=`find /home/admini/android/system/out/target/product/maguro/system/lib/modules -type f -name modules.order`; if [ "$mdpath" != "" ];then mpath=`dirname $mdpath`; ko=`find $mpath/kernel -type f -name *.ko`; for i in $ko; do /home/admini/android/system/prebuilts/gcc/linux-x86/arm/arm-eabi-4.6/bin/arm-eabi-strip --strip-unneeded $i; mv $i /home/admini/android/system/out/target/product/maguro/system/lib/modules/; done; fi
mdpath=`find /home/admini/android/system/out/target/product/maguro/system/lib/modules -type f -name modules.order`; if [ "$mdpath" != "" ];then mpath=`dirname $mdpath`; rm -rf $mpath; fi
[email protected]:~/android/system$
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