question: public AbstractASMBackend ( SootClass sc , int javaVersion ) { this . sc = sc ; int minVersion = getMinJavaVersion ( sc ) ; if ( javaVersion == 0 ) javaVersion = Options . java_version_default ; if ( javaVersion != Options . java_version_default && javaVersion < minVersion ) { throw new IllegalArgumentException ( "Enforced Java version " + translateJavaVersion ( javaVersion ) + " too low to support required features (" + translateJavaVersion ( minVersion ) + " required)" ) ; } javaVersion = Math . max ( javaVersion , minVersion ) ; switch ( javaVersion ) { case Options . java_version_1_1 : this . javaVersion = Opcodes . V1_1 ; break ; case Options . java_version_1_2 : this . javaVersion = Opcodes . V1_2 ; break ; case Options . java_version_1_3 : this . javaVersion = Opcodes . V1_3 ; break ; case Options . java_version_1_4 : this . javaVersion = Opcodes . V1_4 ; break ; case Options . java_version_1_5 : this . javaVersion = Opcodes . V1_5 ; break ; case Options . java_version_1_6 : this . javaVersion = Opcodes . V1_6 ; break ; case Options . java_version_1_7 : this . javaVersion = Opcodes . V1_7 ; break ; case Options . java_version_1_8 : this . javaVersion = Opcodes . V1_8 ; break ; } }
target:  Creates a new ASM backend