Created
March 10, 2017 13:50
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package org.javolution.io; | |
import java.nio.ByteBuffer; | |
/** | |
* Created by Administrator on 2017/3/10 0010. | |
* 导入库 | |
* javolution | |
*/ | |
public class StructTest { | |
public static class MyStruct extends Struct { | |
public final Struct.Signed32 leftAddress = new Signed32(); | |
public final Struct.Signed32 op = new Signed32(); | |
public final Struct.Signed32 rightAddress = new Signed32(); | |
public final Struct.Signed32 data = new Signed32(); | |
} | |
static final int lenght = 8192; | |
public static void main(String[] args) throws Exception { | |
//int max = 536870912; //512mb | |
MyStruct struct = new MyStruct(); | |
int size = struct.size(); | |
System.out.println("MyStruct结构体大小:" + size + "bytes"); | |
ByteBuffer memory = ByteBuffer.allocate(lenght); | |
struct.setByteBuffer(memory, 0); | |
//+:+ data:1 | |
//top | |
int left = size - 1; | |
int right = size + size - 1; | |
System.out.println(left); | |
System.out.println(right); | |
struct.op.set('+'); | |
struct.leftAddress.set(size - 1); | |
struct.rightAddress.set(size + size - 1); | |
System.out.println(struct.getByteBufferPosition()); | |
System.out.println(struct); | |
//left | |
struct.setByteBufferPosition(size - 1); | |
struct.op.set(1); | |
struct.data.set(1); | |
System.out.println(struct.getByteBufferPosition()); | |
System.out.println(struct); | |
//right | |
struct.setByteBufferPosition(size + size - 1); | |
struct.op.set(1); | |
struct.data.set(2); | |
System.out.println(struct); | |
System.out.println(struct.getByteBufferPosition()); | |
System.out.println(struct); | |
//计算 | |
struct.setByteBufferPosition(0); | |
System.out.println("结果:" + eval(struct, 0)); | |
} | |
public static final int eval(MyStruct struct, int start) throws Exception { | |
struct.setByteBufferPosition(start); | |
switch (struct.op.get()) { | |
case '+': { | |
int leftAddress = struct.leftAddress.get(); | |
int left = eval(struct, leftAddress); | |
struct.setByteBufferPosition(start); | |
int rightAdddress = struct.rightAddress.get(); | |
int right = eval(struct, rightAdddress); | |
return left + right; | |
} | |
case '-': { | |
int leftAddress = struct.leftAddress.get(); | |
int left = eval(struct, leftAddress); | |
struct.setByteBufferPosition(start); | |
int rightAdddress = struct.rightAddress.get(); | |
int right = eval(struct, rightAdddress); | |
return left - right; | |
} | |
case 1: | |
return struct.data.get(); | |
default: | |
break; | |
} | |
throw new Exception("异常"); | |
} | |
} |
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