34 lines
841 B
Java
34 lines
841 B
Java
public class CharAsciiFilter {
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// 用最少的内存过滤出小写字母
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static final String str = "Aa1b2c3d4e5f6f7";
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// 内存开销更低
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static void good() {
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char[] chars = str.toCharArray();
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int x = 0;
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for (int i = 0; i < chars.length; i++) {
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char c = chars[i];
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if (c >= 97 && c <= 122) {
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chars[x] = c;
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x = x + 1;
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}
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}
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System.out.println(new String(chars, 0, x));
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}
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// 常规解法
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static void general() {
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char[] chars = str.toCharArray();
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StringBuilder sb = new StringBuilder();
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for (char c : chars) {
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// Character.isLetter(c)
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if (c >= 97 && c <= 122) {
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sb.append(c);
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}
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}
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System.out.println(sb);
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}
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}
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