Example usage for java.lang Class newInstance

Introduction

In this page you can find the example usage for java.lang Class newInstance.

Prototype

@CallerSensitive
@Deprecated(since = "9")
public T newInstance() throws InstantiationException, IllegalAccessException

Source Link

Document

Creates a new instance of the class represented by this Class object.

Usage

From source file:X.java

public static void main(String[] args) throws Exception {
    Class<?> clazz = Class.forName("X");
    X x = (X) clazz.newInstance();
    Field f = clazz.getField("i");
    System.out.println(f.getInt(x)); // Output: 10
    f.setInt(x, 20);/*from  ww  w .  j a  v a 2 s  .  c o m*/
    System.out.println(f.getInt(x)); // Output: 20
    f = clazz.getField("PI");
    System.out.println(f.getDouble(null)); // Output: 3.14
    f.setDouble(x, 20);
}

From source file:X.java

public static void main(String[] args) {
    try {/*from   w w w  .  j  ava  2s.co m*/
        Class<?> clazz = Class.forName("X");
        X x = (X) clazz.newInstance();
        Class[] argTypes = { String.class };
        Method method = clazz.getMethod("objectMethod", argTypes);

        System.out.println(method.getDeclaringClass());

    } catch (Exception e) {
        System.err.println(e);
    }
}

From source file:X.java

public static void main(String[] args) {
    try {//from  w  w  w .j  a  v a2  s.c  o m
        Class<?> clazz = Class.forName("X");
        X x = (X) clazz.newInstance();
        Class[] argTypes = { String.class };
        Method method = clazz.getMethod("objectMethod", argTypes);

        System.out.println(method.getDefaultValue());

    } catch (Exception e) {
        System.err.println(e);
    }
}

From source file:MyClass.java

public static void main(String[] args) throws Exception {
    Class<?> clazz = Class.forName("MyClass");
    MyClass x = (MyClass) clazz.newInstance();

    Field f = clazz.getField("i");
    System.out.println(f.getByte(x)); // Output: 10
    f.setByte(x, (byte) 20);
    System.out.println(f.getByte(x)); // Output: 20

}

From source file:X.java

public static void main(String[] args) {
    try {/*from w  ww  .  j av a2  s. c o m*/
        Class<?> clazz = Class.forName("X");
        X x = (X) clazz.newInstance();
        Class[] argTypes = { String.class };
        Method method = clazz.getMethod("objectMethod", argTypes);
        Object[] data = { "Hello" };
        method.invoke(x, data); // Output: Instance method: Hello
        method = clazz.getMethod("classMethod", (Class<?>[]) null);
        method.invoke(null, (Object[]) null); // Output: Class method
    } catch (Exception e) {
        System.err.println(e);
    }
}

From source file:MyClass.java

public static void main(String[] args) throws Exception {
    Class<?> clazz = Class.forName("MyClass");
    MyClass x = (MyClass) clazz.newInstance();

    Field f = clazz.getField("i");
    System.out.println(f.getShort(x));

    f.setShort(x, (short) 9);
    System.out.println(f.getShort(x));

}

From source file:MyClass.java

public static void main(String[] args) throws Exception {
    Class<?> clazz = Class.forName("MyClass");
    MyClass x = (MyClass) clazz.newInstance();

    Field f = clazz.getField("i");
    System.out.println(f.getBoolean(x));

    f.setBoolean(x, false);/* w  w  w .  j  a  v a 2s  .  c o m*/
    System.out.println(f.getBoolean(x));

}

From source file:MyClass.java

public static void main(String[] args) throws Exception {
    Class<?> clazz = Class.forName("MyClass");
    MyClass x = (MyClass) clazz.newInstance();

    Field f = clazz.getField("i");
    System.out.println(f.getFloat(x));

    f.setFloat(x, 9.99F);/*  ww w. ja  v  a 2s. c o  m*/
    System.out.println(f.getFloat(x));

}

From source file:MyClass.java

public static void main(String[] args) throws Exception {
    Class<?> clazz = Class.forName("MyClass");
    MyClass x = (MyClass) clazz.newInstance();

    Field f = clazz.getField("i");
    System.out.println(f.getLong(x));

    f.setLong(x, 9L);// w w  w. j  a  v a2 s.c o m
    System.out.println(f.getLong(x));

}

From source file:MyClass.java

public static void main(String[] args) throws Exception {
    Class<?> clazz = Class.forName("MyClass");
    MyClass x = (MyClass) clazz.newInstance();

    Field f = clazz.getField("i");
    System.out.println(f.getDouble(x));

    f.setDouble(x, 9.99);//  w ww.  j  av a 2s .c  o m
    System.out.println(f.getDouble(x));

}