java的Class<?>类型提供了多种方法获取类型的名字。这些方法的返回值区别如下：
测试代码：
1 import java.math.BigDecimal; 2 3 public class TestClassName { 4 public static void main( 5 String[] args 6 ) { 7 char v1 = 'C'; 8 byte v2 = 2; 9 short v3 = 3; 10 int v4 = 4; 11 long v5 = 5; 12 float v6 = 6; 13 double v7 = 7; 14 BigDecimal v8 = BigDecimal.valueOf(8); 15 String v9 = "9"; 16 TestBean v10 = new TestBean(); 17 18 char[] a1 = {'A'}; 19 byte[] a2 = {2}; 20 short[] a3 = {3}; 21 int[] a4 = {4}; 22 long[] a5 = {5}; 23 float[] a6 = {6}; 24 double[] a7 = {7}; 25 BigDecimal[] a8 = {BigDecimal.valueOf(8)}; 26 String[] a9 = {"9", "10"}; 27 TestBean[] a10 = {new TestBean(), new TestBean()}; 28 29 dumpAllNames("char", char.class); 30 dumpAllNames("byte", byte.class); 31 dumpAllNames("short", short.class); 32 dumpAllNames("int", int.class); 33 dumpAllNames("long", long.class); 34 dumpAllNames("float", float.class); 35 dumpAllNames("double", double.class); 36 dumpAllNames("BigDecimal", BigDecimal.class); 37 dumpAllNames("String", String.class); 38 dumpAllNames("TestBean", TestBean.class); 39 40 dumpAllNames("char[]", char[].class); 41 dumpAllNames("byte[]", byte[].class); 42 dumpAllNames("short[]", short[].class); 43 dumpAllNames("int[]", int[].class); 44 dumpAllNames("long[]", long[].class); 45 dumpAllNames("float[]", float[].class); 46 dumpAllNames("double[]", double[].class); 47 dumpAllNames("BigDecimal[]", BigDecimal[].class); 48 dumpAllNames("String[]", String[].class); 49 dumpAllNames("TestBean[]", TestBean[].class); 50 } 51 52 private static void dumpAllNames( 53 String name, 54 Class<?> clazz 55 ) { 56 System.out.println(name + ".name = " + clazz.getName()); 57 System.out.println(name + ".simpleName = " + clazz.getSimpleName()); 58 System.out.println(name + ".canonicalName = " + clazz.getCanonicalName()); 59 System.out.println(name + ".typeName = " + clazz.getTypeName()); 60 } 61 62 private static class TestBean { 63 } 64 }
运行结果：
char.name = char char.simpleName = char char.canonicalName = char char.typeName = char byte.name = byte byte.simpleName = byte byte.canonicalName = byte byte.typeName = byte short.name = short short.simpleName = short short.canonicalName = short short.typeName = short int.name = int int.simpleName = int int.canonicalName = int int.typeName = int long.name = long long.simpleName = long long.canonicalName = long long.typeName = long float.name = float float.simpleName = float float.canonicalName = float float.typeName = float double.name = double double.simpleName = double double.canonicalName = double double.typeName = double BigDecimal.name = java.math.BigDecimal BigDecimal.simpleName = BigDecimal BigDecimal.canonicalName = java.math.BigDecimal BigDecimal.typeName = java.math.BigDecimal String.name = java.lang.String String.simpleName = String String.canonicalName = java.lang.String String.typeName = java.lang.String TestBean.name = TestClassName$TestBean TestBean.simpleName = TestBean TestBean.canonicalName = TestClassName.TestBean TestBean.typeName = TestClassName$TestBean char[].name = [C char[].simpleName = char[] char[].canonicalName = char[] char[].typeName = char[] byte[].name = [B byte[].simpleName = byte[] byte[].canonicalName = byte[] byte[].typeName = byte[] short[].name = [S short[].simpleName = short[] short[].canonicalName = short[] short[].typeName = short[] int[].name = [I int[].simpleName = int[] int[].canonicalName = int[] int[].typeName = int[] long[].name = [J long[].simpleName = long[] long[].canonicalName = long[] long[].typeName = long[] float[].name = [F float[].simpleName = float[] float[].canonicalName = float[] float[].typeName = float[] double[].name = [D double[].simpleName = double[] double[].canonicalName = double[] double[].typeName = double[] BigDecimal[].name = [Ljava.math.BigDecimal; BigDecimal[].simpleName = BigDecimal[] BigDecimal[].canonicalName = java.math.BigDecimal[] BigDecimal[].typeName = java.math.BigDecimal[] String[].name = [Ljava.lang.String; String[].simpleName = String[] String[].canonicalName = java.lang.String[] String[].typeName = java.lang.String[] TestBean[].name = [LTestClassName$TestBean; TestBean[].simpleName = TestBean[] TestBean[].canonicalName = TestClassName.TestBean[] TestBean[].typeName = TestClassName$TestBean[]