com.jchanghong.system.RuntimeInfo Maven / Gradle / Ivy
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package com.jchanghong.system;
import com.jchanghong.core.io.FileUtil;
import java.io.Serializable;
/**
* 运行时信息，包括内存总大小、已用大小、可用大小等
*
* @author looly
*/
public class RuntimeInfo implements Serializable {
private static final long serialVersionUID = 1L;
private final Runtime currentRuntime = Runtime.getRuntime();
/**
* 获得运行时对象
*
* @return {@link Runtime}
*/
public final Runtime getRuntime() {
return currentRuntime;
}
/**
* 获得JVM最大内存
*
* @return 最大内存
*/
public final long getMaxMemory() {
return currentRuntime.maxMemory();
}
/**
* 获得JVM已分配内存
*
* @return 已分配内存
*/
public final long getTotalMemory() {
return currentRuntime.totalMemory();
}
/**
* 获得JVM已分配内存中的剩余空间
*
* @return 已分配内存中的剩余空间
*/
public final long getFreeMemory() {
return currentRuntime.freeMemory();
}
/**
* 获得JVM最大可用内存
*
* @return 最大可用内存
*/
public final long getUsableMemory() {
return currentRuntime.maxMemory() - currentRuntime.totalMemory() + currentRuntime.freeMemory();
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
SystemUtil.append(builder, "Max Memory: ", FileUtil.readableFileSize(getMaxMemory()));
SystemUtil.append(builder, "Total Memory: ", FileUtil.readableFileSize(getTotalMemory()));
SystemUtil.append(builder, "Free Memory: ", FileUtil.readableFileSize(getFreeMemory()));
SystemUtil.append(builder, "Usable Memory: ", FileUtil.readableFileSize(getUsableMemory()));
return builder.toString();
}
}