// sync statement class a { void f() { synchronized (<error descr="Incompatible types. Found: 'null', required: 'java.lang.Object'">null</error>) { } synchronized (<error descr="Incompatible types. Found: 'int', required: 'java.lang.Object'">0</error>) { } synchronized (<error descr="Incompatible types. Found: 'char', required: 'java.lang.Object'">'a'</error>) { } synchronized (<error descr="Incompatible types. Found: 'boolean', required: 'java.lang.Object'">true</error>) { } synchronized (<error descr="Incompatible types. Found: 'void', required: 'java.lang.Object'">System.out.println()</error> ) { } } }