Clazz

public boolean isPrimitive()

Determines if the specified Class object represents a primitive type.

There are nine predefined Class objects to represent the eight primitive types and void.  These are created by the Java Virtual Machine, and have the same names as the primitive types that they represent, namely boolean, byte, char, short, int, long, float, and double.

These objects may only be accessed via the following public static final variables, and are the only Class objects for which this method returns true.

• Returns: true if and only if this class represents a primitive type

判斷是不是原始類型。

Java的原始類型有八種：int, double, float, long, short, boolean, byte, char， void.

只有以這幾中類型調用時，返回true.

示例代碼:

package learn.classes;

import org.junit.Test;
public class Clazz {
    @Test
    public void isPrimitive() throws IllegalArgumentException, IllegalAccessException, NoSuchFieldException, SecurityException{
        Class[] primitiveClasses={int.class,long.class,float.class,long.class,
                boolean.class, byte.class, char.class, short.class,double.class};
        Class[] wrappedClasses={Integer.class,String.class};
        for(Class clazz:primitiveClasses){
            System.out.println(clazz.getSimpleName()+" is isPrimitive: "+clazz.isPrimitive());
        }
        System.out.println("*****************************");
        for(Class clazz:wrappedClasses){
            System.out.println(clazz.getSimpleName()+" is isPrimitive: "+clazz.isPrimitive());
        }
    }
    /*
    int is isPrimitive: true
    long is isPrimitive: true
    float is isPrimitive: true
    long is isPrimitive: true
    boolean is isPrimitive: true
    byte is isPrimitive: true
    char is isPrimitive: true
    short is isPrimitive: true
    double is isPrimitive: true
    *****************************
    Integer is isPrimitive: false
    String is isPrimitive: false
    */

}