利用反射反编译某个类

1.首先创建一个员工类（可以反编译员工类，也可以编译String类或者其他类都可）

public class Employee {

    static {
        System.out.println("Employee静态语句块执行。。。");
    }

    private String name;

    private int age;

    private boolean gender;

    public Employee(){}

    public Employee(String name){}


    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public boolean isGender() {
        return gender;
    }

    public void setGender(boolean gender) {
        this.gender = gender;
    }


}

2.编写反编译代码

public class ReflectTest01 {
    public static void main(String[] args) {

        // 拿到Employee的class类
        Class c1 = String.class;

        // 获取Employee的所有属性<数组>
        Field[] fields = c1.getDeclaredFields();

        // 获取Employee的所有方法
        Method[] methods = c1.getDeclaredMethods();

        StringBuffer sb = new StringBuffer();

        // 类的修饰符+类的简单类名
        sb.append(Modifier.toString(c1.getModifiers()) + " class " + c1.getSimpleName() + " {
");

        // 遍历所有属性
        for (Field field : fields) {
            // 属性的修饰符
            sb.append("	" + Modifier.toString(field.getModifiers()) + " ");
            // 属性的简单类名
            sb.append(field.getType().getSimpleName() + " ");
            // 属性的名称
            sb.append(field.getName() + ";
");
        }

        sb.append("	===================分割线===========================
");

        // 遍历所有方法
        for (Method method : methods) {
            // 方法的修饰符
            sb.append("	" + Modifier.toString(method.getModifiers()) + " ");
            // 返回值类型的简单类名
            sb.append(method.getReturnType().getSimpleName() + " ");
            // 方法的方法名
            sb.append(method.getName() + "(");
            // 形式参数列表
            Class[] parameterTypes = method.getParameterTypes();
            for (int i = 0; i < parameterTypes.length; i++) {
                if (i == parameterTypes.length - 1) {
                    sb.append(parameterTypes[i].getSimpleName() + " args");
                } else {
                    sb.append(parameterTypes[i].getSimpleName() + " args,");
                }

            }
            sb.append("){ }
");
        }
        sb.append("}");
        System.out.println(sb);

    }


}

3.控制台输出

public final class String {
    private final char[] value;
    private int hash;
    private static final long serialVersionUID;
    private static final ObjectStreamField[] serialPersistentFields;
    public static final Comparator CASE_INSENSITIVE_ORDER;
    ===================分割线===========================
    public boolean equals(Object args){ }
    public String toString(){ }
    public int hashCode(){ }
    public volatile int compareTo(Object args){ }
    public int compareTo(String args){ }
    public int indexOf(String args,int args){ }
    static int indexOf(char[] args,int args,int args,String args,int args){ }
    static int indexOf(char[] args,int args,int args,char[] args,int args,int args,int args){ }
    public int indexOf(int args){ }
    public int indexOf(String args){ }
    public int indexOf(int args,int args){ }
    public static String valueOf(char args){ }
    public static String valueOf(Object args){ }
    public static String valueOf(boolean args){ }
    public static String valueOf(char[] args,int args,int args){ }
    public static String valueOf(char[] args){ }
    public static String valueOf(double args){ }
    public static String valueOf(float args){ }
    public static String valueOf(long args){ }
    public static String valueOf(int args){ }
    private static void checkBounds(byte[] args,int args,int args){ }
    public int length(){ }
    public boolean isEmpty(){ }
    public char charAt(int args){ }
    public int codePointAt(int args){ }
    public int codePointBefore(int args){ }
    public int codePointCount(int args,int args){ }
    public int offsetByCodePoints(int args,int args){ }
    public void getChars(int args,int args,char[] args,int args){ }
     void getChars(char[] args,int args){ }
    public byte[] getBytes(){ }
    public byte[] getBytes(String args){ }
    public void getBytes(int args,int args,byte[] args,int args){ }
    public byte[] getBytes(Charset args){ }
    public boolean contentEquals(StringBuffer args){ }
    public boolean contentEquals(CharSequence args){ }
    private boolean nonSyncContentEquals(AbstractStringBuilder args){ }
    public boolean equalsIgnoreCase(String args){ }
    public int compareToIgnoreCase(String args){ }
    public boolean regionMatches(int args,String args,int args,int args){ }
    public boolean regionMatches(boolean args,int args,String args,int args,int args){ }
    public boolean startsWith(String args){ }
    public boolean startsWith(String args,int args){ }
    public boolean endsWith(String args){ }
    private int indexOfSupplementary(int args,int args){ }
    public int lastIndexOf(int args,int args){ }
    static int lastIndexOf(char[] args,int args,int args,char[] args,int args,int args,int args){ }
    static int lastIndexOf(char[] args,int args,int args,String args,int args){ }
    public int lastIndexOf(String args,int args){ }
    public int lastIndexOf(int args){ }
    public int lastIndexOf(String args){ }
    private int lastIndexOfSupplementary(int args,int args){ }
    public String substring(int args){ }
    public String substring(int args,int args){ }
    public CharSequence subSequence(int args,int args){ }
    public String concat(String args){ }
    public String replace(char args,char args){ }
    public String replace(CharSequence args,CharSequence args){ }
    public boolean matches(String args){ }
    public boolean contains(CharSequence args){ }
    public String replaceFirst(String args,String args){ }
    public String replaceAll(String args,String args){ }
    public String[] split(String args,int args){ }
    public String[] split(String args){ }
    public static transient String join(CharSequence args,CharSequence[] args){ }
    public static String join(CharSequence args,Iterable args){ }
    public String toLowerCase(Locale args){ }
    public String toLowerCase(){ }
    public String toUpperCase(){ }
    public String toUpperCase(Locale args){ }
    public String trim(){ }
    public char[] toCharArray(){ }
    public static transient String format(Locale args,String args,Object[] args){ }
    public static transient String format(String args,Object[] args){ }
    public static String copyValueOf(char[] args,int args,int args){ }
    public static String copyValueOf(char[] args){ }
    public native String intern(){ }
}

将String类的全部属性和方法都反编译出来了。。。挺有意思