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HashMap应指定初始长度

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This commit is contained in:
achao 2021-11-10 20:27:33 +08:00
parent d53f1ff15e
commit 4f04bd121a
2 changed files with 9 additions and 9 deletions
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2
hutool-core/src/main/java/cn/hutool/core/collection/CollStreamUtil.java
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@ -179,7 +179,7 @@ public class CollStreamUtil {
Set<K> key = new HashSet<>();
key.addAll(map1.keySet());
key.addAll(map2.keySet());
Map<K, V> map = new HashMap<>();
Map<K, V> map = MapUtil.newHashMap(key.size());
for (K t : key) {
X x = map1.get(t);
Y y = map2.get(t);

16
hutool-core/src/main/java/cn/hutool/core/util/NumberUtil.java
View File

@ -7,12 +7,12 @@ import cn.hutool.core.math.Calculator;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.math.RoundingMode;
import java.security.SecureRandom;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.text.ParseException;
import java.util.Collection;
import java.util.HashSet;
import java.util.Random;
import java.util.Set;
/**
@ -1362,8 +1362,8 @@ public class NumberUtil {
throw new UtilException("Size is larger than range between begin and end!");
}
Random ran = new Random();
Set<Integer> set = new HashSet<>();
SecureRandom ran = new SecureRandom();
Set<Integer> set = new HashSet<>(Math.max((int) (size / .75f) + 1, 16));
while (set.size() < size) {
set.add(begin + ran.nextInt(end - begin));
}
@ -2159,14 +2159,14 @@ public class NumberUtil {
* @since 4.0.9
*/
public static BigDecimal toBigDecimal(String numberStr) {
if(StrUtil.isBlank(numberStr)){
if (StrUtil.isBlank(numberStr)) {
return BigDecimal.ZERO;
}
try {
// 支持类似于 1,234.55 格式的数字
final Number number = parseNumber(numberStr);
if(number instanceof BigDecimal){
if (number instanceof BigDecimal) {
return (BigDecimal) number;
} else {
return new BigDecimal(number.toString());
@ -2512,7 +2512,7 @@ public class NumberUtil {
public static Number parseNumber(String numberStr) throws NumberFormatException {
try {
final NumberFormat format = NumberFormat.getInstance();
if(format instanceof DecimalFormat){
if (format instanceof DecimalFormat) {
// issue#1818@Github
// 当字符串数字超出double的长度时，会导致截断，此处使用BigDecimal接收
((DecimalFormat) format).setParseBigDecimal(true);
@ -2699,9 +2699,9 @@ public class NumberUtil {
* @since 5.7.8
*/
public static double toDouble(Number value) {
if(value instanceof Float){
if (value instanceof Float) {
return Double.parseDouble(value.toString());
}else{
} else {
return value.doubleValue();
}
}