java | 内存溢出 「堆」

讲解堆的内存溢出。

代码

package com.redisc;

import lombok.extern.slf4j.Slf4j;

import java.util.ArrayList;
import java.util.List;

class A {
};

class B {
};

@Slf4j(topic = "c.Run")
public class Run {

    static A a = new A();
    static B b = new B();

    public static void main(String[] args) throws Exception {
        int i = 0;
        try {
            List<String> list = new ArrayList<>();
            String a = "hello";
            while (true) {
                list.add(a);
                a = a + a;
                i++;
            }
        } catch (Throwable e) {
            e.printStackTrace();
            System.out.println(i);
        }

    }

}

输出

java.lang.OutOfMemoryError: Java heap space
	at java.util.Arrays.copyOf(Arrays.java:3332)
	at java.lang.AbstractStringBuilder.ensureCapacityInternal(AbstractStringBuilder.java:124)
	at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:448)
	at java.lang.StringBuilder.append(StringBuilder.java:136)
	at com.redisc.Run.main(Run.java:27)
25