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import java.lang.reflect.Array; | |
public class ArrayReflection { | |
public static void main(String[] args) throws Exception { | |
Class<String> clazz = String.class; | |
Class<?> arrayClass = Array.newInstance(clazz, 0).getClass(); | |
System.out.println(arrayClass.getName()); | |
Class<String[]> arrayClass2 = toArrayClass(clazz); |
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import java.lang.reflect.Field; | |
import java.lang.reflect.GenericArrayType; | |
import java.lang.reflect.ParameterizedType; | |
import java.lang.reflect.Type; | |
import java.util.List; | |
public class GenericTypeSample { | |
public List<Integer>[] testField; | |
public static void main(String[] args) throws Exception { |
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import static org.junit.Assert.*; | |
import java.lang.reflect.Field; | |
import java.lang.reflect.GenericArrayType; | |
import java.lang.reflect.ParameterizedType; | |
import java.lang.reflect.Type; | |
import java.lang.reflect.TypeVariable; | |
import java.lang.reflect.WildcardType; | |
import java.util.List; |
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import java.util.ArrayList; | |
import java.util.List; | |
/** | |
* <p>Demonstrating why the Object.getClass() method's return type should be | |
* Class<? extends |T|> but not Class<? extends T>, where |T| is the erasure | |
* of the static type T. </p> | |
* <p> | |
* Type parameter of every Class instance should always be reifiable type | |
* or wildcard type with reifiable upper bound. |
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package com.github.ryoasai; | |
import static org.hamcrest.CoreMatchers.*; | |
import static org.junit.Assert.*; | |
import java.lang.reflect.Method; | |
import java.util.ArrayList; | |
import java.util.Arrays; | |
import java.util.HashMap; | |
import java.util.List; |
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import java.lang.reflect.*; | |
public class Outer { | |
private String outer = "outer"; | |
public class Inner { | |
public void hello() { | |
System.out.println("Hello World" + outer); // NullPointerException at this line. | |
} |
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package com.github.ryoasai; | |
import static org.hamcrest.CoreMatchers.*; | |
import static org.junit.Assert.*; | |
import java.util.List; | |
import org.hamcrest.Matcher; | |
import org.junit.Test; | |
import org.springframework.beans.BeanWrapper; |
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package com.github.ryoasai; | |
import java.util.Date; | |
import javax.validation.constraints.NotNull; | |
import javax.validation.constraints.Size; | |
import org.joda.time.DateMidnight; | |
import org.springframework.format.annotation.DateTimeFormat; |
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String.metaClass.destructiveReverse << { | |
def chars = delegate.value; | |
chars.eachWithIndex {e, i -> | |
chars[- i - 1] = e | |
} | |
} | |
def s = 'groovy' | |
s.destructiveReverse() | |
assert s == 'yvoorg' |
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public class BinaryStringPrinter { | |
public static void print(byte value) { | |
System.out.println(zeroPadding(8, Integer.toBinaryString(value))); | |
} | |
public static void print(short value) { | |
System.out.println(zeroPadding(16, Integer.toBinaryString(value))); | |
} |
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