字符 Java类型 C类型
V void void Z jboolean boolean I jint int J jlong long D jdouble double F jfloat float B jbyte byte C jchar char S jshort short
数组则以"["开始，用两个字符表示
[I jintArray int[] [F jfloatArray float[] [B jbyteArray byte[] [C jcharArray char[] [S jshortArray short[] [D jdoubleArray double[] [J jlongArray long[] [Z jbooleanArray boolean[]