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java.util collection data structure classes
java.io file operations
java.math multiprecision arithmetics
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java.nio the New I/O framework for Java
java.net networking operations, sockets, DNS lookups,
java.security key generation, encryption and decryption
java.sql Java Database Connectivity (JDBC) to access databases
java.awt basic hierarchy of packages for native GUI components
javax.swing hierarchy of packages for platform-independent rich GUI components
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byte | [-128;127] | |
short | [-32768; 32767] | |
int | [-2147483648; 2147483647] | |
long | [-263;263] | |
float | ~1,4*10-45 ~3,4*1038 | |
double | ~4,9*10-324 ~1,8*10308 | |
char | [0;65535], Unicode | |
boolean | 1 , , - | false/true |
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