你們都說得對，可是下面這個代碼怎么優化呢？

public String(int[] codePoints, int offset, int count) {

if (offset < 0) {

throw new StringIndexOutOfBoundsException(offset);

}

if (count < 0) {

throw new StringIndexOutOfBoundsException(count);

}

// Note: offset or count might be near -1>>>1.

if (offset > codePoints.length - count) {

throw new StringIndexOutOfBoundsException(offset + count);

}

final int end = offset + count;

// Pass 1: Compute precise size of char[]

int n = count;

for (int i = offset; i < end; i++) {

int c = codePoints[i];

if (Character.isBmpCodePoint(c))

continue;

else if (Character.isValidCodePoint(c))

n++;

else throw new IllegalArgumentException(Integer.toString(c));

}

// Pass 2: Allocate and fill in char[]

final char[] v = new char[n];

for (int i = offset, j = 0; i < end; i++, j++) {

int c = codePoints[i];

if (Character.isBmpCodePoint(c))

v[j] = (char)c;

else

Character.toSurrogates(c, v, j++);

}

this.value = v;

}

總結

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