import java.util.ArrayList;
import java.util.List;
public class Main {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        while (true) {
            list.add("OutOfMemoryError example");  // 無(wú)限增長(zhǎng)的列表導(dǎo)致內(nèi)存泄漏
        }
    }
}

public class Main {
    public static void main(String[] args) {
        int[] largeArray = new int[Integer.MAX_VALUE];  // 嘗試分配超大數(shù)組導(dǎo)致OutOfMemoryError
    }
}

java -Xmx128m Main  # 配置堆內(nèi)存為128MB，但程序需要更多內(nèi)存，導(dǎo)致OutOfMemoryError

import java.util.ArrayList;
import java.util.List;
public class Main {
    private static List<String> list = new ArrayList<>();
    public static void main(String[] args) {
        for (int i = 0; i < 1000000; i++) {
            addToList("OutOfMemoryError example " + i);
        }
    }
    private static void addToList(String str) {
        if (list.size() < 1000) {
            list.add(str);  // 控制列表大小，避免無(wú)限增長(zhǎng)導(dǎo)致內(nèi)存泄漏
        }
    }
}

public class Main {
    public static void main(String[] args) {
        // 使用合適大小的數(shù)據(jù)結(jié)構(gòu)
        int[] largeArray = new int[1000000];  // 合理大小的數(shù)組，避免OutOfMemoryError
        for (int i = 0; i < largeArray.length; i++) {
            largeArray[i] = i;
        }
    }
}

java -Xmx1024m Main  # 增加堆內(nèi)存配置為1024MB，避免OutOfMemoryError

import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.List;
public class Main {
    public static void main(String[] args) {
        List<WeakReference<String>> list = new ArrayList<>();
        for (int i = 0; i < 1000000; i++) {
            list.add(new WeakReference<>(new String("OutOfMemoryError example " + i)));
        }
    }
}

java -Xms512m -Xmx2048m Main  # 配置初始堆內(nèi)存為512MB，最大堆內(nèi)存為2048MB

public class Main {
    public static void main(String[] args) {
        // 避免不必要的對(duì)象創(chuàng)建
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < 1000000; i++) {
            sb.append("OutOfMemoryError example ").append(i);
        }
        System.out.println(sb.toString());
    }
}