Use f-strings in JavaCompiler

mesonbuild/compilers/java.py

@@ -93,14 +93,14 @@ class JavaCompiler(BasicLinkerIsCompilerMixin, Compiler):
         pc = subprocess.Popen(self.exelist + [src], cwd=work_dir)
         pc.wait()
         if pc.returncode != 0:
-            raise EnvironmentException('Java compiler %s can not compile programs.' % self.name_string())
+            raise EnvironmentException(f'Java compiler {self.name_string()} can not compile programs.')
         runner = shutil.which(self.javarunner)
         if runner:
             cmdlist = [runner, obj]
             pe = subprocess.Popen(cmdlist, cwd=work_dir)
             pe.wait()
             if pe.returncode != 0:
-                raise EnvironmentException('Executables created by Java compiler %s are not runnable.' % self.name_string())
+                raise EnvironmentException(f'Executables created by Java compiler {self.name_string()} are not runnable.')
         else:
             m = "Java Virtual Machine wasn't found, but it's needed by Meson. " \
                 "Please install a JRE.\nIf you have specific needs where this " \