modified:   Java/17_super/Sub.java
	new file:   Java/19_instanceof/TestInstanceof.java
	new file:   Java/20_reuse/TestInherit.java
	new file:   Java/21_data_conversion/Primitive2String.java
	new file:   Java/22_toString/testToString.java
	new file:   Java/23_inner_empty_obj/NullAccessStatic.java
	new file:   Java/24_Singleton/TestSingletion.java
	new file:   Java/25_final/TestFinalLocalVariable.java
	modified:   daily_schedu_txt.c