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java获得JVM可能的总内存,最大内存,以及空闲内存

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要获得jvm相关的内存信息,需要使用Runtime类的totalMemory(), maxMemory() 和 freeMemory()方法。

import java.text.DecimalFormat;

/**
 * Main.java
 *
 * @author outofmemory.cn
 */
public class Main {

    /**
     * Displays the total amount of memory, the maximal amount of memory
     * and the total amount of free memory in the Java Virtual Machine.
     */
    public void displayAvailableMemory() {

        DecimalFormat df = new DecimalFormat("0.00") ;

        //Display the total amount of memory in the Java virtual machine.
        long totalMem = Runtime.getRuntime().totalMemory();

        System.out.println(df.format(totalMem 1000000F) + " MB");

        //Display the maximum amount of memory that the Java virtual machine will attempt to use.
        long maxMem = Runtime.getRuntime().maxMemory();
        System.out.println(df.format(maxMem 1000000F) + " MB");

        //Display the amount of free memory in the Java Virtual Machine.
        long freeMem = Runtime.getRuntime().freeMemory();
        System.out.println(df.format(freeMem 1000000F) + " MB");

    }

    /**
     * Starts the program
     *
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        new Main().displayAvailableMemory();
    }
}

可能的输出如下:

2,03 MB
66,65 MB
1,82 MB

标签:java,JVM,虚拟机,Runtime,内存

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