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java - 试图解决 - 字符串索引超出范围

问题描述

我收到此错误：

Carregando os mapas: Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String 
index out of range: 4800
        at java.lang.String.substring(Unknown Source)
        at estaticos.Criptografador.descompilarMapaData(Criptografador.java:147)
        at variables.Mapa.<init>(Mapa.java:1306)
        at estaticos.GestorSQL.CARREGAR_MAPAS(GestorSQL.java:696)
        at estaticos.MundoDofus.criarServer(MundoDofus.java:1398)
        at estaticos.VrauEMU.main(VrauEMU.java:130)

我正在尝试解决，但我不能。

我的代码：（原来的模拟器是西班牙文，所以celula = celda之前）

public static Map<Integer, Celula> descompilarMapaData(Mapa mapa, String dData) {
        Map<Integer, Celula> celulas = new TreeMap<Integer, Celula>();
        for (int f = 0; f < dData.length(); f += 10) {
            String CellData = dData.substring(f, f + 10);
            List<Byte> celulaInfo = new ArrayList<Byte>();
            for (int i = 0; i < CellData.length(); i++)
                celulaInfo.add((byte) getNumeroPorValorHash(CellData.charAt(i)));
            int caminhavel = (celulaInfo.get(2) & 56) >> 3;// 0 = nao, 1 = meio, 4 = sim
            boolean linhaDeVisao = (celulaInfo.get(0) & 1) != 0;
            int layerObject2 = ( (celulaInfo.get(0) & 2) << 12) + ( (celulaInfo.get(7) & 1) << 12) + (celulaInfo.get(8) << 6)
                    + celulaInfo.get(9);
            boolean layerObjeto2Interac = ( (celulaInfo.get(7) & 2) >> 1) != 0;
            int objeto = (layerObjeto2Interac ? layerObject2 : -1);

            celulas.put(f / 10, new Celula(mapa, f / 10, caminhavel != 0, linhaDeVisao, objeto));
        }
        return celulas;

标签： javastringexceptionrangesubstring

解决方案

问题在于迭代边界：

 for (int f = 0; f < dData.length(); f += 10) {
            String CellData = dData.substring(f, f + 10);

除非dData.length()碰巧能被 10 整除，否则这将迭代超出范围。为了说明，下面的代码片段将尝试读取 0-10 和 10-20，即使虚构的数组边界仅为 0-15。

for (let i = 0; i < 25; i += 10)
  console.log(i, i + 10);

也许简单地限制上限substring.length()就足够了：

 for (int f = 0; f < dData.length(); f += 10) {
            int upperBound = min(f + 10, dData.length());
            String CellData = dData.substring(f, upperBound));

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